POD18 is a 4 channel audio interface providing the conversion of 4 unbalanced signals to balanced signals. POD18 allows the use of low cost consumer grade record/playback equipment in a professional environment through impedance matching and level control. Front panel trim control lets the user match, record and playback levels of consumer equipment to the professional standards employed. Connections to POD18, on the rear panel, are made via XLR 3 type connectors for the balanced output, and RCA phono jacks for the unbalanced inputs.