Add to Cart Boss MPD-4 MIDI Pad (USED) x9512 Boss Effects MSRP: Now: $79.99 Was: Up for sale we have a used Boss MPD-4 MIDI Pad in great working condition! Please see photos for full cosmetic details. Power supply not included. In-house serial ISI19512 MPD4U MSRP: Now: $79.99 Was: Add to Cart