- Fixes a minor bug in the OPL2 and OPL3 reset code
- implements #97: The ability to do a hard reset of the OPL2 Audio Board or OPL3 Duo! board using the SerialPassthrough sketches. A hard reset can be performed by writing value 165 (0xA5) to register 255 (0xFF) and bank 0 (in case of OPL3 Duo!). There should be a 2ms delay after performing a hard reset this way.