Playback and Talkback in Master and Monitor Controller ToolMst
Analog Summing Gear ToolMix
The pictures shows the playback section of the ToolMst master and monitor controller with volume control, mono switch, and headphone jack, the adding source selector with switches for the two aux masters, the main stereo master MIX, the control room source and a cut switch. The talkback section is shown on the right side. It combines a build in electret condensor microphone with gain control pot, the main talkback switch and the TB TO STU PHONES switch that enables automatic switches of talkback to the playbakc outputs.
Master and Monitor Controller ToolMst  

ToolMst detailed View Playback and Talkback