It's certainly easier to use the fader for group edits but it is possible to lasso nodes across tracks and edit them all at once too. Here is another way using remote control, MIDI tracks and a virtual MIDI cable to control automation. This video shows: Track 1 through 3 with volume faders setup using remote control listening to MIDI channel 1 CC7 from MIDI track 7 Track 4 through 6 have volume faders setup using remote control listening to MIDI channel 2 CC7 from MIDI track 8
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