Used once. M-Audio M-Track Solo Combo Input, Phantom Power, 48-KHz, 2-Channel USB Audio Interface This is the M-Audio M-Track Solo audio interface. A portable USB audio interface for high-resolution recording on Mac/PC. Equipped with a combo input with phantom power and Line/Instrument input terminals, it supports recording from various audio sources. It is USB bus-powered, so no external power adapter is required, making it highly portable. Includes DAW software such as MPC Beats, software such as AIR Music Tech Electric, and 80 AIR-brand effect plugins.