This is a simple USB MIDI controller with 1 Pitch Fader, 1 Toggle Switch, 1LED, up/down Pitch Benders and Arduino Micro.
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Arduino Micro (Official) https://store.arduino.cc/products/arduino-micro
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MIDIUSB library is required. https://github.com/arduino-libraries/MIDIUSB
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Open Controller Settings on Traktor PRO
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Choose the "Controller Manager", select "General Midi" and set IN-port to "Arduino Micro"
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Set the Modifier Condition of M8 as C3= 1 / D3= 2 by notes sent from toggle switch.
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Set Control Change value to Tempo Adjust (=pitch fader) with Modifier8(M8). If M8=1 then Assignment="Deck A" and If M8=2 then Assignment="Deck B".
- Set Pitch Bend
- So you can pitch up/down with SL-1200 fader, and select Target Deck (A/B) by the toggle switch!
I use classic Technics SL-1200's pitch fader for this controller. I got it from Yahoo auction in Japan.