diff options
| -rw-r--r-- | scumm/instrument.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/scumm/instrument.cpp b/scumm/instrument.cpp index c845ab8ec2..dbe0d0eae0 100644 --- a/scumm/instrument.cpp +++ b/scumm/instrument.cpp @@ -421,10 +421,21 @@ void Instrument_Roland::send (MidiChannel *mc) { if (_native_mt32) { // _instrument.device_id = mc->getNumber(); _instrument.device_id = 0x10; + + // Remap instrument to appropriate address space. int address = 0x010000 + mc->getNumber() * 246; _instrument.address[0] = (address >> 14) & 0x7F; _instrument.address[1] = (address >> 7) & 0x7F; _instrument.address[2] = (address ) & 0x7F; + + // Recompute checksum. + byte checksum = 0; + byte *ptr = (byte *) &_instrument + 4; + int i; + for (i = 4; i < sizeof (_instrument) - 1; ++i) + checksum -= *ptr++; + _instrument.checksum = checksum & 0x7F; + mc->device()->sysEx ((byte *) &_instrument, sizeof (_instrument)); } else { // Convert to a GM program change. |