OPLL: 90%

effects implemented.
TODO:
- FM macros
- muting
- proper drum mode
- proper VRC7

src/engine/platform/opll.h

@@ -57,8 +57,8 @@ class DivPlatformOPLL: public DivDispatch {
         vol(0),
         pan(3) {}
     };
-    Channel chan[9];
-    bool isMuted[9];
+    Channel chan[11];
+    bool isMuted[11];
     struct QueuedWrite {
       unsigned short addr;
       unsigned char val;