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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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand

Studio: Korg PA4X/Yamaha DGX670/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/K&M stand