YM2610 registers

= SSG part =

If 'Mode' = 1, the EG is used instead of the 4bit volume value. f = 8M / (Coarse*256 + Fine) ?

= FM part =

= ADPCM-A part =

'Dump' in register $00 is the key on/off bit. Write 0 to start playing specified channels and write 1 to stop playing.

= ADPCM-B part =