While I wait on parts to build this I experimented with some knobs to get an idea of what the finished device will look like. My parts are back ordered until November.
The BOM specs some Rogan Knobs similar to what is found on Buchla synths. I sent with some aluminum knobs. The octave knob has a slightly smaller skirt.
I think these look good. After putting it all together like this I realized the two smaller knobs have a matte texture while the larger skirted knob has a brushed and glossy texture.
I got these knobs at: LoveMySwitches.com
You can get the Rogan knobs at: Amplifiedparts.com