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Amazon.com: USB2.0 10FT Data Transfer Host Cable Cord For USB Cable For Akai MPK25 MPK49 MPK61 MPK88 Professional MIDI Keyboard PC Cord (Original Version) : Electronics
Midi Converter Box | Midi Usb Converter | Usb Midi Host Box | Midi Usb Audio - Usb Box - Aliexpress
Kenton MIDI USB Host MkII (for Class Compliant MIDI devices) - Control Voltage