change chan osc range - PLEASE READ

as of now the range is ~32768, either from -16384 to 16383, or 0 to 32767.
it previously was -32768 to 32767 (~65536).

this change was made to better suit chips that only output a positive value.
if you are working on a new chip, update your code and shift right by one if necessary.

src/engine/platform/bubsyswsg.cpp

@@ -55,7 +55,7 @@ void DivPlatformBubSysWSG::acquire(short** buf, size_t len) {
         chanOut=chan[i].waveROM[k005289.addr(i)]*(regPool[2+i]&0xf);
         out+=chanOut;
         if (writeOscBuf==0) {
-          oscBuf[i]->data[oscBuf[i]->needle++]=chanOut<<7;
+          oscBuf[i]->data[oscBuf[i]->needle++]=chanOut<<6;
         }
       }
     }