What is the best way to balance and mute/erase the instruments on midi files for use in my 3000. i can't seem to save my changes from my board - do i need to do on a computer?

thanks,
zuki
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)