4x6 midi controller built from a cheap midi keyboard for controlling PD and Ableton Live.
Midi Controller
This is how I build my own MIDI controllers for less than US$40.00 (and how you can build yours, too - The Nerd Musician
Arduino Uno Midi Controller : 9 Steps (with Pictures) - Instructables
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MOTU Micro Express 4x6 USB MIDI Interface
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AKAI Professional APC64 Ableton MIDI Controller with 8 Touch Strips, Step Sequencer, 64 RGB Velocity-Sensitive Pads, CV Gates, MIDI In & Out, USB-C : Musical Instruments
DIY 100mm MIDI fader control box