Master Section in Master and Monitor Controller ToolMst - Analog Summing Gear ToolMix
The picture shows the master section of a ToolMst with the main stereo master with insert switch, pre post master fader switch for the insert, the balance pot and the corresponding BAL switch that enables this control, and the rotary master fader. The two aux master section are equipped with master faders, cut and pfl switches.
Master and Monitor Controller ToolMst  

ToolMst detailed View Master Section