Beyerdynamic DT 1770 Pro 250 Ohm Studio Recording Headphones+M-Audio Interface | Audio Savings
User manual M-Audio Midisport 2x2 (English - 26 pages)
M-AUDIO AIR 192-4 2 Inch 2-Out USB Audio Interface User Guide
Amazon.com: M-Audio M-Track Duo – USB Audio Interface for Recording, Streaming and Podcasting with Dual XLR, Line & DI Inputs, plus a Software Suite Included : Musical Instruments
M-Audio M-Track 2X2M specifications
M-Audio AIR 192x6 2-In And 2-Out USB Audio Interface | PSSL ProSound and Stage Lighting