The way I usually do this is via the MUTE TRIGs. So if there is stuff I want to be always muted at the start of switching to the next pattn. I just add MUTE TRIGs to the steps and save the pattn, then when I have switched to that pattn, I remove the MUTE TRIGs. I can then re-save the pattn on the fly if I need to pull off some pattn reloading tricks later or whatever.
However, usually I just do this by knowing my pattns & tracks, and muting the voices I want start muted before I switch the pattn.
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