The EXTC is a guitar effects interface designed for use inside the Radial Workhorse and other API compatible rack 500 series systems. It features a balanced line level input with variable guitar level send & receive controls for hi-impedance guitar effects. Transformer isolation combined with class-A discreet electronics assures optimal signal transfer. This makes the EXTC the perfect interface for all kinds of effects that otherwise are difficult to use, cause noise or create unbearable hum.