You forget. This was a future bassist. Twisting knobs randomly, is a talent we are born with.
I thought that was guitar players. "I can't get my tone!" I get a kick out of watching some guitar players tweaking a knob during their whole solo. Hmmm...need the bridge pickup at 4.1 instead of 4.3. Oh, too much, needs 4.2. No, don't like that. My triplet deedle-da-deedle pattern sounds too thin. Neck pickup from 9.5 to 10. Dammit - why can't this thing go to 11?