A close-up of some of the modules. These knobs were used on Betsy. They are Spectrol sealed pots (about $3.50) and full aluminum knobs with two hex-key set screws (about $2 each!) - they feel great, but I don't know if they're worth the cost. I used much cheaper stuff ($1.50 pots, $0.50 knobs) for the ASM-1 panels - and, while they definitely feel lighter and more gritty when you hold and turn them, functionally they're just as good, and you don't really notice the difference when you're actually patching and playing.