TRANSFORMER-BALANCED (TBL1S). Transformer-balanced AUX input module. Transformer-isolated line-level input. Gain/Trim control. Bass & Treble controls. Gating w/Threshold & Duration. Mute send & receive. Variable ducking level when muted/gated. Fade back from mute/gate. 4 Priority levels. Bus assignable. Pluggable screw terminal connections.