diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index aac777f3..d7605269 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -869,7 +869,7 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
           sample->depth=DIV_SAMPLE_DEPTH_YMZ_ADPCM;
         }
       }
-      if (ds.version>=0x1a) {
+      if (ds.version>=0x1b) {
         // what the hell man...
         cutStart=reader.readI();
         cutEnd=reader.readI();
@@ -903,7 +903,7 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
             reader.read(data,length*2);
           }
 
-          if (ds.version>0x1a) {
+          if (ds.version>0x1b) {
             if (cutStart!=0 || cutEnd!=length) {
               // cut data
               short* newData=new short[cutEnd-cutStart];
diff --git a/src/engine/platform/sound/su.cpp b/src/engine/platform/sound/su.cpp
index 9033a0d7..d74377cd 100644
--- a/src/engine/platform/sound/su.cpp
+++ b/src/engine/platform/sound/su.cpp
@@ -39,13 +39,13 @@
 void SoundUnit::NextSample(short* l, short* r) {
   // run channels
   for (int i=0; i<8; i++) {
-    if (chan[i].vol==0 && !chan[i].flags1.swvol) {
+    if (chan[i].vol==0 && !(chan[i].flags1&32)) {
       fns[i]=0;
       continue;
     }
-    if (chan[i].flags0.pcm) {
+    if (chan[i].flags0&8) {
       ns[i]=pcm[chan[i].pcmpos];
-    } else switch (chan[i].flags0.shape) {
+    } else switch (chan[i].flags0&7) {
       case 0:
         ns[i]=(((cycle[i]>>15)&127)>chan[i].duty)*127;
         break;
@@ -69,11 +69,13 @@ void SoundUnit::NextSample(short* l, short* r) {
         break;
     }
 
-    if (chan[i].flags0.ring) {
+    // ring mod
+    if (chan[i].flags0&16) {
       ns[i]=(ns[i]*ns[(i+1)&7])>>7;
     }
     
-    if (chan[i].flags0.pcm) {
+    // PCM
+    if (chan[i].flags0&8) {
       if (chan[i].freq>0x8000) {
         pcmdec[i]+=0x8000;
       } else {
@@ -84,18 +86,18 @@ void SoundUnit::NextSample(short* l, short* r) {
         if (chan[i].pcmpos<chan[i].pcmbnd) {
           chan[i].pcmpos++;
           if (chan[i].pcmpos==chan[i].pcmbnd) {
-            if (chan[i].flags1.pcmloop) {
+            if (chan[i].flags1&4) {
               chan[i].pcmpos=chan[i].pcmrst;
             }
           }
           chan[i].pcmpos&=(pcmSize-1);
-        } else if (chan[i].flags1.pcmloop) {
+        } else if (chan[i].flags1&4) {
           chan[i].pcmpos=chan[i].pcmrst;
         }
       }
     } else {
       ocycle[i]=cycle[i];
-      if (chan[i].flags0.shape==5) {
+      if ((chan[i].flags0&7)==5) {
         switch ((chan[i].duty>>4)&3) {
           case 0:
             cycle[i]+=chan[i].freq*1-(chan[i].freq>>3);
@@ -114,7 +116,7 @@ void SoundUnit::NextSample(short* l, short* r) {
         cycle[i]+=chan[i].freq;
       }
       if ((cycle[i]&0xf80000)!=(ocycle[i]&0xf80000)) {
-        if (chan[i].flags0.shape==4) {
+        if ((chan[i].flags0&7)==4) {
           lfsr[i]=(lfsr[i]>>1|(((lfsr[i]) ^ (lfsr[i] >> 2) ^ (lfsr[i] >> 3) ^ (lfsr[i] >> 5) ) & 1)<<31);
         } else {
           switch ((chan[i].duty>>4)&3) {
@@ -136,7 +138,7 @@ void SoundUnit::NextSample(short* l, short* r) {
           }
         }
       }
-      if (chan[i].flags1.restim) {
+      if (chan[i].flags1&8) {
         if (--rcycle[i]<=0) {
           cycle[i]=0;
           rcycle[i]=chan[i].restimer;
@@ -144,18 +146,18 @@ void SoundUnit::NextSample(short* l, short* r) {
         }
       }
     }
-    fns[i]=ns[i]*chan[i].vol*(chan[i].flags0.pcm?4:2);
-    if (chan[i].flags0.fmode!=0) {
+    fns[i]=ns[i]*chan[i].vol*((chan[i].flags0&8)?4:2);
+    if ((chan[i].flags0&0xe0)!=0) {
       int ff=chan[i].cutoff;
       nslow[i]=nslow[i]+(((ff)*nsband[i])>>16);
       nshigh[i]=fns[i]-nslow[i]-(((256-chan[i].reson)*nsband[i])>>8);
       nsband[i]=(((ff)*nshigh[i])>>16)+nsband[i];
-      fns[i]=(((chan[i].flags0.fmode&1)?(nslow[i]):(0))+((chan[i].flags0.fmode&2)?(nshigh[i]):(0))+((chan[i].flags0.fmode&4)?(nsband[i]):(0)));
+      fns[i]=(((chan[i].flags0&32)?(nslow[i]):(0))+((chan[i].flags0&64)?(nshigh[i]):(0))+((chan[i].flags0&128)?(nsband[i]):(0)));
     }
     nsL[i]=(fns[i]*SCpantabL[(unsigned char)chan[i].pan])>>8;
     nsR[i]=(fns[i]*SCpantabR[(unsigned char)chan[i].pan])>>8;
     oldfreq[i]=chan[i].freq;
-    if (chan[i].flags1.swvol) {
+    if (chan[i].flags1&32) {
       if (--swvolt[i]<=0) {
         swvolt[i]=chan[i].swvol.speed;
         if (chan[i].swvol.dir) {
@@ -195,7 +197,7 @@ void SoundUnit::NextSample(short* l, short* r) {
         }
       }
     }
-    if (chan[i].flags1.swfreq) {
+    if (chan[i].flags1&16) {
       if (--swfreqt[i]<=0) {
         swfreqt[i]=chan[i].swfreq.speed;
         if (chan[i].swfreq.dir) {
@@ -219,7 +221,7 @@ void SoundUnit::NextSample(short* l, short* r) {
         }
       }
     }
-    if (chan[i].flags1.swcut) {
+    if (chan[i].flags1&64) {
       if (--swcutt[i]<=0) {
         swcutt[i]=chan[i].swcut.speed;
         if (chan[i].swcut.dir) {
@@ -243,11 +245,11 @@ void SoundUnit::NextSample(short* l, short* r) {
         }
       }
     }
-    if (chan[i].flags1.resosc) {
+    if (chan[i].flags1&1) {
       cycle[i]=0;
       rcycle[i]=chan[i].restimer;
       ocycle[i]=0;
-      chan[i].flags1.resosc=0;
+      chan[i].flags1&=~1;
     }
     if (muted[i]) {
       nsL[i]=0;
diff --git a/src/engine/platform/sound/su.h b/src/engine/platform/sound/su.h
index d8e0f270..502aabac 100644
--- a/src/engine/platform/sound/su.h
+++ b/src/engine/platform/sound/su.h
@@ -62,28 +62,8 @@ class SoundUnit {
       unsigned short freq;
       signed char vol;
       signed char pan;
-      union {
-        unsigned char val;
-        struct {
-          unsigned char shape: 3;
-          unsigned char pcm: 1;
-          unsigned char ring: 1;
-          unsigned char fmode: 3;
-        };
-      } flags0;
-      union {
-        unsigned char val;
-        struct {
-          unsigned char resosc: 1;
-          unsigned char resfilt: 1;
-          unsigned char pcmloop: 1;
-          unsigned char restim: 1;
-          unsigned char swfreq: 1;
-          unsigned char swvol: 1;
-          unsigned char swcut: 1;
-          unsigned char padding: 1;
-        };
-      } flags1;
+      unsigned char flags0;
+      unsigned char flags1;
       unsigned short cutoff;
       unsigned char duty;
       unsigned char reson;