Hello Giovanni,
There is a lot of flexibility in the Genesys where MIDI is concerned so there are possibly several ways to set the unit up to work with your 2 accordions.
One way would be to make the necessary settings in the MIDI edit page for the first accordion and store this as a Preset. Then make the needed MIDI adjustments for the other accordion and save that as another preset.
Select the appropriate preset for the accordion you want to use and then enter the MIDI edit page and turn on the MIDI Lock button. Now any new presets or memories will use the locked-in MIDI settings. To change to the other accordion, turn MIDI Lock off, select the preset created for that accordion and then turn MIDI Lock back on.
Once you get the Genesys XP and have a little time to experiment, let me know if you still need help.
Best Regards,
Dave
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Wm. David McMahan
Nat'l Product and Support Manager
Generalmusic USA
GEM Community Forums