PS…
The score editor provides a way to explode a stave into tracks, from there it’s easy to tag them with a voice (Soprano, Alto, Tenor, etc.) and merge it all back together. At that point Logic Editor can select by ‘voice’.
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Select all the parts on the track you wish to explode (right click a track in the track controls area and choose ‘select all events’.
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Open the score editor.
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Tap ctrl a to select everything on the score and go to Scores/Functions/Explode.
You have a lot of options to experiment with here. One method I find pretty quick and painless is to simply chose “To New Tracks”. Set Number of tracks to one less than your max number of voices (the current track will be reused).
In my case there are three voices in an organ part. I end up with 3 separate tracks for each ‘voice’ of the chord.
Now it’s easy for me to right click each track one at a time, select all events, then go to key-editor, tap ctrl-a (select all), and choose a voice (Soprano, Alto, etc.).
Now I can drag all the parts onto a single track again and do a MIDI Bounce. It’s all back into a single part.
At this point the Logical Editor can be used to select based on voice assignments.