$50 · USB/MIDI Interface with Preamps

M-Audio Fast Track Pro Mobile 4 x 4 USB audio/MIDI interface with preamps. never used in original packaging; had paid $299 Features include: 2 front-panel mic/line/instrument inputs with phantom power for condenser microphones, inserts for outboard effects, balanced and unbalanced analog outputs, S//PDIF coaxial I/O, MIDI I/O, and more. An all-in-one device for recording music and audio on the go, converting signals from analog instruments and MIDI devices into a digital format that a computer or mobile device can understand It combines three key functions into a single, portable unit: Audio interface: Converts analog audio signals, like those from a microphone or guitar, into digital signals for your computer and vice-versa. Preamps: Boosts weak audio signals to a standard "line level" that your computer can use for high-quality recording. MIDI interface: Translates musical performance data from MIDI-compatible instruments, such as a keyboard or drum machine, into digital instructions for a computer. Compatible with older computer systems: minimum requirements: Windows XP (SP2), Mac OS X 10.3.9/10.4.2 and higher