Amazon.com: UpBright New Global 6V AC/DC Adapter Compatible with M-Audio M-Track Quad MTRACKQUAD 4 Channel Audio Plus USB MIDI Interface 6VDC Power Supply Cord Cable PS Wall Home Battery Charger Mains PSU :
M-Audio M-Track Quad Reviews | Sweetwater
User manual M-Audio M-Track Quad (English - 36 pages)
M-Audio M-Track Quad USB Audio Midi Interface - Mercury Music South Africa