Yamaha QX21 Step sequence recorder, MIDI Action recorder, Sequencer.
Musical Instruments:Pro Audio Equipment:MIDI Keyboards and Controllers – Yamaha QX21 Step sequence recorder, MIDI Action recorder, Sequencer.
QX21
Yamaha QX21 Digital Sequencer Sequence Recorder Vintage Retro 1980s
Musical Instruments:Pro Audio Equipment:Samplers and Sequencers – Yamaha QX21 Digital Sequencer Sequence Recorder Vintage Retro 1980s