if you want to play trio with sound arranger changing the preset voices and other accompaniments muted you don't need to go to all the complication of making mute sound edits and setting them in every arranger setup. Just set the msa to panel memory, mute the accomp tracks in the display and save 4 registrations. You can play as many presets and variations as you like, with different sounds in the sound arranger, and the accomps 5, 4, and/or 3 will remain muted permanently. Then there is no need to set mute sounds in every accomp part 5, 4 and/or 3 in every sound arranger setup you choose, you can just ignore those parts.