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M-Audio Oxygen 49 MK IV 49-Key USB MIDI Keyboard Controller MKIV MK4 - Walmart.com
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Amazon.com: M-Audio Oxygen 49 (MKV) – 49 Key USB MIDI Keyboard Controller With Beat Pads, Smart Chord & Scale Modes, Arpeggiator and Software Suite Included,Black : Everything Else
Amazon.com: M Audio Oxygen 49 IV | 49 Key USB/MIDI Keyboard With 8 Trigger Pads & A Full Consignment of Production/Performance Ready Controls : Musical Instruments