MONO, STEREO AUX (MAX1R, SAX1R). Unbalanced input modules. 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. Stereo to mono summing option (SAX1R). RCA connectors.