[mlyle]

> make the volume control a real analog knob that's directly in the output circuit

I don't miss noisy potentiometers :D

And having a bus with user operations being streamed to it means that designers can choose mappings and behaviors late.

The issue is the delay. I have a lot of amplifiers with knobs that are perceptually instant, even if they really are encoders behind the scene. Stuff is fast enough now that there's no reason for delay. I've built control systems that use encoders that operate at 1000Hz over slower embedded networks than are in modern cars.