KuSh Audio Gain Train Monitor Control Unit, from Kush

The KuSh Audio UBK Main Gain is a world class, ultra-transparent active monitor control yielding incredible quality and versatility at an unbelievable price. This 2 in 2 out unit contains a volume control knob, mono button, and independent left and right channel mutes. 

Function Junction Expansion Unit

The Function Junction expansion unit adds even more control and versatility to the revolutionary Main Gain monitor control. The Function Junction adds two additional inputs and outputs, auto-program mute, and talkback mic level control. The unit also feature two separate headphone amps, each with individual level control for precision monitoring when you need it.