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USB 2.0 To Midi Cable for Music Keyboard Piano Interface Connection Adapter 14276884585 | eBay
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Korg microKEY 25 USB Midi Keyboard – Megatone Music
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The best portable (and affordable) USB MIDI controllers | Engadget
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M-Audio Oxygen 25-Key USB MIDI Keyboard Controller OXYGEN25MKV
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Stage Right by Monoprice SRK61 USB MIDI Keyboard Controller with Pads - Monoprice.com