From e94d1b857fa6cdd66172278258a85916de78946b Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Wed, 1 Jun 2022 18:02:34 -0500
Subject: [PATCH] newVolumeScaling, part 2

---
 src/engine/platform/genesis.cpp    | 18 +++++++++---------
 src/engine/platform/genesisext.cpp | 14 +++++++-------
 src/engine/platform/opll.cpp       |  2 +-
 src/engine/platform/segapcm.cpp    |  2 +-
 src/engine/platform/tx81z.cpp      | 18 +++++++++---------
 src/engine/platform/ym2203.cpp     | 18 +++++++++---------
 src/engine/platform/ym2203ext.cpp  |  8 ++++----
 src/engine/platform/ym2608.cpp     | 16 ++++++++--------
 src/engine/platform/ym2608ext.cpp  | 10 +++++-----
 src/engine/platform/ym2610.cpp     | 16 ++++++++--------
 src/engine/platform/ym2610b.cpp    | 16 ++++++++--------
 src/engine/platform/ym2610bext.cpp | 10 +++++-----
 src/engine/platform/ym2610ext.cpp  | 10 +++++-----
 13 files changed, 79 insertions(+), 79 deletions(-)

diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 6cba30dd..81ddd148 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -321,7 +321,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
@@ -329,7 +329,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -384,7 +384,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -437,7 +437,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -553,7 +553,7 @@ void DivPlatformGenesis::muteChannel(int ch, bool mute) {
       rWrite(baseAddr+ADDR_TL,127);
     } else {
       if (isOutput[chan[ch].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[ch].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[ch].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -634,7 +634,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
             if (!chan[c.chan].active || chan[c.chan].insChanged) {
-              rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+              rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
             }
           } else {
             if (chan[c.chan].insChanged) {
@@ -706,7 +706,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -847,7 +847,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[c.chan].state.alg][c.value]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -1038,7 +1038,7 @@ void DivPlatformGenesis::forceIns() {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index cc4abc88..8b4629b9 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -54,7 +54,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
         rWrite(baseAddr+0x40,127);
       } else {
         if (opChan[ch].insChanged) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
         }
       }
       if (opChan[ch].insChanged) {
@@ -92,7 +92,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       }
       break;
     }
@@ -198,7 +198,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else if (isOutput[chan[2].state.alg][c.value]) {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       } else {
         rWrite(baseAddr+0x40,op.tl);
       }
@@ -381,8 +381,8 @@ void DivPlatformGenesisExt::muteChannel(int ch, bool mute) {
     rWrite(baseAddr+0x40,127);
     immWrite(baseAddr+0x40,127);
   } else if (isOutput[chan[2].state.alg][ordch]) {
-    rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch-2].vol&0x7f))/127));
-    immWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch-2].vol&0x7f))/127));
+    rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch-2].vol&0x7f,127));
+    immWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch-2].vol&0x7f,127));
   } else {
     rWrite(baseAddr+0x40,op.tl);
     immWrite(baseAddr+0x40,op.tl);
@@ -460,7 +460,7 @@ void DivPlatformGenesisExt::forceIns() {
         if (isOpMuted[j]) {
           rWrite(baseAddr+0x40,127);
         } else if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[j].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[j].vol&0x7f,127));
         } else {
           rWrite(baseAddr+0x40,op.tl);
         }
@@ -469,7 +469,7 @@ void DivPlatformGenesisExt::forceIns() {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
diff --git a/src/engine/platform/opll.cpp b/src/engine/platform/opll.cpp
index c232e68e..58893d46 100644
--- a/src/engine/platform/opll.cpp
+++ b/src/engine/platform/opll.cpp
@@ -392,7 +392,7 @@ void DivPlatformOPLL::muteChannel(int ch, bool mute) {
       rWrite(baseAddr+ADDR_TL,127);
     } else {
       if (isOutput[chan[ch].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[ch].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[ch].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
diff --git a/src/engine/platform/segapcm.cpp b/src/engine/platform/segapcm.cpp
index 46fa1977..6d2f6b82 100644
--- a/src/engine/platform/segapcm.cpp
+++ b/src/engine/platform/segapcm.cpp
@@ -87,7 +87,7 @@ void DivPlatformSegaPCM::tick(bool sysTick) {
 
     if (parent->song.newSegaPCM) {
       if (chan[i].std.vol.had) {
-        chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+        chan[i].outVol=(chan[i].vol*MIN(64,chan[i].std.vol.val))>>6;
         chan[i].chVolL=(chan[i].outVol*chan[i].chPanL)/127;
         chan[i].chVolR=(chan[i].outVol*chan[i].chPanR)/127;
         if (dumpWrites) {
diff --git a/src/engine/platform/tx81z.cpp b/src/engine/platform/tx81z.cpp
index 569f722b..f15de0e7 100644
--- a/src/engine/platform/tx81z.cpp
+++ b/src/engine/platform/tx81z.cpp
@@ -270,7 +270,7 @@ void DivPlatformTX81Z::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
@@ -278,7 +278,7 @@ void DivPlatformTX81Z::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -354,7 +354,7 @@ void DivPlatformTX81Z::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -407,7 +407,7 @@ void DivPlatformTX81Z::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -499,7 +499,7 @@ void DivPlatformTX81Z::muteChannel(int ch, bool mute) {
       rWrite(baseAddr+ADDR_TL,127);
     } else {
       if (isOutput[chan[ch].state.alg][i]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[ch].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[ch].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -529,7 +529,7 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
             if (!chan[c.chan].active || chan[c.chan].insChanged) {
-              rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+              rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
             }
           } else {
             if (chan[c.chan].insChanged) {
@@ -594,7 +594,7 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -694,7 +694,7 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[c.chan].state.alg][c.value]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -985,7 +985,7 @@ void DivPlatformTX81Z::forceIns() {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
diff --git a/src/engine/platform/ym2203.cpp b/src/engine/platform/ym2203.cpp
index 3303fbf8..cebf7087 100644
--- a/src/engine/platform/ym2203.cpp
+++ b/src/engine/platform/ym2203.cpp
@@ -338,7 +338,7 @@ void DivPlatformYM2203::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
@@ -346,7 +346,7 @@ void DivPlatformYM2203::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -396,7 +396,7 @@ void DivPlatformYM2203::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -441,7 +441,7 @@ void DivPlatformYM2203::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -553,7 +553,7 @@ int DivPlatformYM2203::dispatch(DivCommand c) {
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
             if (!chan[c.chan].active || chan[c.chan].insChanged) {
-              rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+              rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
             }
           } else {
             if (chan[c.chan].insChanged) {
@@ -612,7 +612,7 @@ int DivPlatformYM2203::dispatch(DivCommand c) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[c.chan].state.alg][i]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -690,7 +690,7 @@ int DivPlatformYM2203::dispatch(DivCommand c) {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[c.chan].state.alg][c.value]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -882,7 +882,7 @@ void DivPlatformYM2203::muteChannel(int ch, bool mute) {
       rWrite(baseAddr+ADDR_TL,127);
     } else {
       if (isOutput[chan[ch].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[ch].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[ch].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -899,7 +899,7 @@ void DivPlatformYM2203::forceIns() {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
diff --git a/src/engine/platform/ym2203ext.cpp b/src/engine/platform/ym2203ext.cpp
index 95937207..1a4f60bb 100644
--- a/src/engine/platform/ym2203ext.cpp
+++ b/src/engine/platform/ym2203ext.cpp
@@ -45,7 +45,7 @@ int DivPlatformYM2203Ext::dispatch(DivCommand c) {
         rWrite(baseAddr+0x40,127);
       } else {
         if (opChan[ch].insChanged) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
         }
       }
       if (opChan[ch].insChanged) {
@@ -84,7 +84,7 @@ int DivPlatformYM2203Ext::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       }
       break;
     }
@@ -416,7 +416,7 @@ void DivPlatformYM2203Ext::muteChannel(int ch, bool mute) {
   if (isOpMuted[ch-2]) {
     rWrite(baseAddr+0x40,127);
   } else if (isOutput[ins->fm.alg][ordch]) {
-    rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch-2].vol&0x7f))/127));
+    rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch-2].vol&0x7f,127));
   } else {
     rWrite(baseAddr+0x40,op.tl);
   }
@@ -431,7 +431,7 @@ void DivPlatformYM2203Ext::forceIns() {
         rWrite(baseAddr+ADDR_TL,127);
       } else {
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
index b6f1e16f..c02cbba8 100644
--- a/src/engine/platform/ym2608.cpp
+++ b/src/engine/platform/ym2608.cpp
@@ -500,12 +500,12 @@ void DivPlatformYM2608::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -559,7 +559,7 @@ void DivPlatformYM2608::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -609,7 +609,7 @@ void DivPlatformYM2608::tick(bool sysTick) {
       if (m.tl.had) {
         op.tl=127-m.tl.val;
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -836,7 +836,7 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
           if (!chan[c.chan].active || chan[c.chan].insChanged) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           }
         } else {
           if (chan[c.chan].insChanged) {
@@ -916,7 +916,7 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
         unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -1020,7 +1020,7 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
       DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
       op.tl=c.value2;
       if (isOutput[chan[c.chan].state.alg][c.value]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -1223,7 +1223,7 @@ void DivPlatformYM2608::forceIns() {
       unsigned short baseAddr=chanOffs[i]|opOffs[j];
       DivInstrumentFM::Operator& op=chan[i].state.op[j];
       if (isOutput[chan[i].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
diff --git a/src/engine/platform/ym2608ext.cpp b/src/engine/platform/ym2608ext.cpp
index 441640b4..4802cc65 100644
--- a/src/engine/platform/ym2608ext.cpp
+++ b/src/engine/platform/ym2608ext.cpp
@@ -45,7 +45,7 @@ int DivPlatformYM2608Ext::dispatch(DivCommand c) {
         rWrite(baseAddr+0x40,127);
       } else {
         if (opChan[ch].insChanged) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
         }
       }
       if (opChan[ch].insChanged) {
@@ -84,7 +84,7 @@ int DivPlatformYM2608Ext::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       }
       break;
     }
@@ -416,7 +416,7 @@ void DivPlatformYM2608Ext::muteChannel(int ch, bool mute) {
   if (isOpMuted[ch-2]) {
     rWrite(baseAddr+0x40,127);
   } else if (isOutput[ins->fm.alg][ordch]) {
-    rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch-2].vol&0x7f))/127));
+    rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch-2].vol&0x7f,127));
   } else {
     rWrite(baseAddr+0x40,op.tl);
   }
@@ -431,7 +431,7 @@ void DivPlatformYM2608Ext::forceIns() {
         if (isOpMuted[j]) {
           rWrite(baseAddr+0x40,127);
         } else if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[j].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[j].vol&0x7f,127));
         } else {
           rWrite(baseAddr+0x40,op.tl);
         }
@@ -440,7 +440,7 @@ void DivPlatformYM2608Ext::forceIns() {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 89ccc6c0..de3112c7 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -544,12 +544,12 @@ void DivPlatformYM2610::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -603,7 +603,7 @@ void DivPlatformYM2610::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -653,7 +653,7 @@ void DivPlatformYM2610::tick(bool sysTick) {
       if (m.tl.had) {
         op.tl=127-m.tl.val;
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -883,7 +883,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
           if (!chan[c.chan].active || chan[c.chan].insChanged) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           }
         } else {
           if (chan[c.chan].insChanged) {
@@ -963,7 +963,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
         unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -1067,7 +1067,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
       DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
       op.tl=c.value2;
       if (isOutput[chan[c.chan].state.alg][c.value]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -1270,7 +1270,7 @@ void DivPlatformYM2610::forceIns() {
       unsigned short baseAddr=chanOffs[i]|opOffs[j];
       DivInstrumentFM::Operator& op=chan[i].state.op[j];
       if (isOutput[chan[i].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index 0e466f6f..172fbca2 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -523,12 +523,12 @@ void DivPlatformYM2610B::tick(bool sysTick) {
     chan[i].std.next();
 
     if (chan[i].std.vol.had) {
-      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol,MIN(127,chan[i].std.vol.val),127);
       for (int j=0; j<4; j++) {
         unsigned short baseAddr=chanOffs[i]|opOffs[j];
         DivInstrumentFM::Operator& op=chan[i].state.op[j];
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -582,7 +582,7 @@ void DivPlatformYM2610B::tick(bool sysTick) {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
@@ -632,7 +632,7 @@ void DivPlatformYM2610B::tick(bool sysTick) {
       if (m.tl.had) {
         op.tl=127-m.tl.val;
         if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -861,7 +861,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
           if (!chan[c.chan].active || chan[c.chan].insChanged) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
           }
         } else {
           if (chan[c.chan].insChanged) {
@@ -941,7 +941,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
         unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
         DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
         if (isOutput[chan[c.chan].state.alg][i]) {
-          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
         } else {
           rWrite(baseAddr+ADDR_TL,op.tl);
         }
@@ -1045,7 +1045,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
       DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
       op.tl=c.value2;
       if (isOutput[chan[c.chan].state.alg][c.value]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[c.chan].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
@@ -1248,7 +1248,7 @@ void DivPlatformYM2610B::forceIns() {
       unsigned short baseAddr=chanOffs[i]|opOffs[j];
       DivInstrumentFM::Operator& op=chan[i].state.op[j];
       if (isOutput[chan[i].state.alg][j]) {
-        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
       } else {
         rWrite(baseAddr+ADDR_TL,op.tl);
       }
diff --git a/src/engine/platform/ym2610bext.cpp b/src/engine/platform/ym2610bext.cpp
index cd7e494b..42a1f2e1 100644
--- a/src/engine/platform/ym2610bext.cpp
+++ b/src/engine/platform/ym2610bext.cpp
@@ -45,7 +45,7 @@ int DivPlatformYM2610BExt::dispatch(DivCommand c) {
         rWrite(baseAddr+0x40,127);
       } else {
         if (opChan[ch].insChanged) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
         }
       }
       if (opChan[ch].insChanged) {
@@ -84,7 +84,7 @@ int DivPlatformYM2610BExt::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       }
       break;
     }
@@ -416,7 +416,7 @@ void DivPlatformYM2610BExt::muteChannel(int ch, bool mute) {
   if (isOpMuted[ch-2]) {
     rWrite(baseAddr+0x40,127);
   } else if (isOutput[ins->fm.alg][ordch]) {
-    rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch-2].vol&0x7f))/127));
+    rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch-2].vol&0x7f,127));
   } else {
     rWrite(baseAddr+0x40,op.tl);
   }
@@ -431,7 +431,7 @@ void DivPlatformYM2610BExt::forceIns() {
         if (isOpMuted[j]) {
           rWrite(baseAddr+0x40,127);
         } else if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[j].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[j].vol&0x7f,127));
         } else {
           rWrite(baseAddr+0x40,op.tl);
         }
@@ -440,7 +440,7 @@ void DivPlatformYM2610BExt::forceIns() {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index bf6df44e..8e940381 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -45,7 +45,7 @@ int DivPlatformYM2610Ext::dispatch(DivCommand c) {
         rWrite(baseAddr+0x40,127);
       } else {
         if (opChan[ch].insChanged) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
         }
       }
       if (opChan[ch].insChanged) {
@@ -84,7 +84,7 @@ int DivPlatformYM2610Ext::dispatch(DivCommand c) {
       if (isOpMuted[ch]) {
         rWrite(baseAddr+0x40,127);
       } else {
-        rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+        rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
       }
       break;
     }
@@ -416,7 +416,7 @@ void DivPlatformYM2610Ext::muteChannel(int ch, bool mute) {
   if (isOpMuted[ch]) {
     rWrite(baseAddr+0x40,127);
   } else if (isOutput[ins->fm.alg][ordch]) {
-    rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
+    rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[ch].vol&0x7f,127));
   } else {
     rWrite(baseAddr+0x40,op.tl);
   }
@@ -431,7 +431,7 @@ void DivPlatformYM2610Ext::forceIns() {
         if (isOpMuted[j]) {
           rWrite(baseAddr+0x40,127);
         } else if (isOutput[chan[i].state.alg][j]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[j].vol&0x7f))/127));
+          rWrite(baseAddr+0x40,127-VOL_SCALE_LOG(127-op.tl,opChan[j].vol&0x7f,127));
         } else {
           rWrite(baseAddr+0x40,op.tl);
         }
@@ -440,7 +440,7 @@ void DivPlatformYM2610Ext::forceIns() {
           rWrite(baseAddr+ADDR_TL,127);
         } else {
           if (isOutput[chan[i].state.alg][j]) {
-            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+            rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG(127-op.tl,chan[i].outVol&0x7f,127));
           } else {
             rWrite(baseAddr+ADDR_TL,op.tl);
           }