Update.
I just went through every step again, trying different bass parts - and it's working.
Go back to previous Bass parts that didn't work. Guess what? They're working.
So, my current status is that Sampletank is working for all instruments.
Did you try reassigning everything?
HTH
Trevor


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