The YM2610 only has native loop support for ADPCM-B; any ADPCM-A looping has to be done in software/Z80 code. (This is typically achieved by having loop point data somewhere in the M1 file, then watching Status 1 (Port 06) for the relevant channel to end playback, and finally set the new playback/ending points from the loop data in ROM.)

Ok, I'll try your z80 code in your m1-rom. Maybe I use a bad version of mvs tracker.

For MIDI, you would have to use a module tracker that allows importing MIDI files (such as OpenMPT), then convert to MOD and import that MOD in MVSTracker. However, only the first four channels will be used, and you will have to re-assign instruments.

I success in converting mid to mod with openMPT but can't transfert instrument. Do I need to create my Instrument from openMPT ?

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