Keyboards
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Reloop Keyfader
Very tiny mini keyboard with lots of controls (faders, encoders, and potentiometers).
around $90
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M-Audio Keystation 49es (Legacy)
It has a pitch wheel, mod wheel, volume slider, and 8 free programmable buttons. A sustain pedal also works natively via a 1/4" Jack. It's a simple plug and play.
about $60 (used)
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Keith McMillen k-board
MPE capable, USB-C, very portable and durable.
around $96
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Novation ReMote 25SL mk1
MIDI keyboard controller 8 Sliders 8 Pots 8 Encoders
about $50
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Arturia KeyStep Pro
A standalone melody, chords and drum sequencer, that also offers a controller mode.
around $540