I think you're looking for something like the functionality of the Mackie Control Surface can produce.

If so, then it's not currently available in BIAB (althought it's been requested many times).

Volume Automation is available though, but not through the mixer.

You can change instruments though from Bar Settings - function key <F5>


BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones