From 05b5265bbb0c90998f962ab20396484c9bf4949c Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Sun, 21 Aug 2022 19:46:48 -0500
Subject: [PATCH] YM2612: #632

---
 src/engine/platform/genesis.cpp | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 0260ea06..143a90fe 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -279,10 +279,24 @@ void DivPlatformGenesis::tick(bool sysTick) {
       }
     }
 
-    if (chan[i].std.panL.had) {
-      chan[i].pan=chan[i].std.panL.val&3;
-      if (i<6) {
-        rWrite(chanOffs[i]+ADDR_LRAF,(IS_REALLY_MUTED(i)?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    if (i>=5 && chan[i].furnaceDac) {
+      if (chan[i].std.panL.had) {
+        chan[5].pan&=1;
+        chan[5].pan|=chan[i].std.panL.val?2:0;
+      }
+      if (chan[i].std.panR.had) {
+        chan[5].pan&=2;
+        chan[5].pan|=chan[i].std.panR.val?1:0;
+      }
+      if (chan[i].std.panL.had || chan[i].std.panR.had) {
+        rWrite(chanOffs[5]+ADDR_LRAF,(IS_REALLY_MUTED(i)?0:(chan[5].pan<<6))|(chan[5].state.fms&7)|((chan[5].state.ams&3)<<4));
+      }
+    } else {
+      if (chan[i].std.panL.had) {
+        chan[i].pan=chan[i].std.panL.val&3;
+        if (i<6) {
+          rWrite(chanOffs[i]+ADDR_LRAF,(IS_REALLY_MUTED(i)?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+        }
       }
     }