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The M-Audio Fast Track Pro is a legacy 4x4 mobile USB audio and MIDI interface designed for home recording and mobile production. Because it is a discontinued legacy product, it is primarily available today on the pre-owned market.Hardware Specifications & FeaturesI/O Configuration: 4-in / 4-out connectivity including S/PDIF digital and 5-pin MIDI I/O.Audio Resolution: Features up to 24-bit / 96kHz recording capability.Preamps: Dual front-panel mic/instrument preamps with switchable +48V phantom power.DJ Features: Dual output pairs and an A/B source switch on the headphone output for cueing.Power: Functions via USB bus power or an external power adapter.