--- tinysid-0.94-a/sidengine.c	2006-05-25 14:08:52.000000000 +0200
+++ tinysid-0.94-b/sidengine.c	2026-05-23 17:18:50.803658162 +0200
@@ -380,13 +380,18 @@
       // filtered channel and dont forget to blank out osc3 if desired	  
 #ifdef USE_FILTER
       if (v<2 || filter.v3ena)
+      {
         if (osc[v].filter)
+        {
           //outf+=((float)osc[v].envval*(float)outv-0x8000000)/0x30000000;
 		  outf+=(((int)(outv-0x80))*osc[v].envval)>>22;
-		
+        }	
         else
+        {
           //outo+=((float)osc[v].envval*(float)outv-0x8000000)/0x30000000;
                   outo+=(((int)(outv-0x80))*osc[v].envval)>>22;
+        }
+      }
 #endif
 #ifndef USE_FILTER