99     opl->write(0xb0 + c, 0);	// key off  in update()
108       case 68: opl->write(0xa0 + c,0x81); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
109       case 69: opl->write(0xa0 + c,0xb0); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
110       case 70: opl->write(0xa0 + c,0xca); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
111       case 71: opl->write(0xa0 + c,0x2); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
112       case 65: opl->write(0xa0 + c,0x41); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
113       case 66: opl->write(0xa0 + c,0x87); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
114       case 67: opl->write(0xa0 + c,0xae); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
115       case 17: opl->write(0xa0 + c,0x6b); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
116       case 18: opl->write(0xa0 + c,0x98); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
117       case 20: opl->write(0xa0 + c,0xe5); opl->write(0xb0 + c,0x21 + 4 * channel[c].octave); break;  in update()
118       case 21: opl->write(0xa0 + c,0x20); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
119       case 15: opl->write(0xa0 + c,0x63); opl->write(0xb0 + c,0x22 + 4 * channel[c].octave); break;  in update()
144 	  opl->write(0xe0 + c + (c+6),channel[c].waveform);  in update()
146 	  opl->write(0xe0 + c,channel[c].waveform);  in update()
169   opl->init(); opl->write(1, 32);  in rewind()
177     opl->write(0x20+op_table[i],inst[i].value[4]);  in rewind()
178     opl->write(0x23+op_table[i],inst[i].value[0]);  in rewind()
179     opl->write(0x40+op_table[i],inst[i].value[5]);  in rewind()
180     opl->write(0x43+op_table[i],inst[i].value[1]);  in rewind()
181     opl->write(0x60+op_table[i],inst[i].value[6]);  in rewind()
182     opl->write(0x63+op_table[i],inst[i].value[2]);  in rewind()
183     opl->write(0x80+op_table[i],inst[i].value[7]);  in rewind()
184     opl->write(0x83+op_table[i],inst[i].value[3]);  in rewind()