Hey thanks for your response!
It's for writing/previewing vocal harmonies in my own voice with waves tune.
I've got waves tune as a midi controlled AU effect, and it is taking a sidechain from a bus my lead vox channel is sending to, then tuning the sidechain audio to the note present in the midi track. I want to only hear what is coming through that relationship when a midi note is actively controlling the output. Currently, when no midi note is present, the track just doubles my lead vocals. (Only the lead vocal's channel strip, the bus is muted and otherwise only audible through these midi tracks; if I mute the midi tracks or turn their mixer volume all the way down, the vocals are not doubled anymore).
So in this case, volume automation will affect the output, but the midi volume controller will not.
But yeah, there are enough gaps that its a huge task, and it would also be great if I could just play a note on a keyboard and audition a harmony in my own voice without the track being doubled or tripled when I'm not playing a key. The idea is super low impact composing/rapid-prototyping using my own voice before I commit session time to recording the harmonies.
One solution I was looking at was just duplicating the lead vocal track for every harmony track and just removing the audio where I don't want to send it to waves, but again the gaps are numerous and it gets really annoying if I re-record the lead to change a lyric or something.
Thanks again for your help!