Unbalanced input for guitar, or guitar through pedalboard Unbalanced guitar output or headphone out (600 Ohm) Balanced output (200 Ohm) for direct recording or PA use (Not digital audio) Aux stereo inputs for MP3, CD or DAT Master output controls the overall and AUX levels The Guitar volume knob controls the instrument volume in relation to the Master volume The Speaker Simulation switch for choosing between open and closed back speaker cabinet simulations