Use The Novation Circuit As A 51-Knob MIDI Controller – Synthtopia
Overview | Grand Central USB MIDI Controller in CircuitPython | Adafruit Learning System
ParksTools, a series of budget knob/fader-only non-fancy MIDI controllers
Knobbee 32 – A Open-Firmware Arduino-Based USB-MIDI Controller – Synthtopia
Kenton Killamix Mini USB MIDI Controller For Ableton & Other Software/Hardware Applications (blue LED & non click encoder version) at Juno Records.
Midi Controllers and DIY kits - Shik
Khanka Hard Travel Case Replacement for Donner DMK 25 MIDI Keyboard Controller Music Mini Key With 8 Backlit Drum Pads, 4 Knobs 4 control faders MIDI Controller,Case Only: Buy Online at Best
All We Need Is KNOBS! - Page 2 — Audiobus Forum
Livid Instruments
The Complete Guide to Choosing a MIDI Controller — Pro Audio Files
Bastl 60Knobs – Pump up your jam, 60 knobs at once
Do You Love Knobs? This New MIDI Controller Has 68 Of Them | Telekom Electronic Beats