Summing Mixer with 2 x ToolMix8 and ToolMst
Analog Summing Gear ToolMix
ToolMix summing mixer with 16 mono inputs and 4 stereo inputs with two ToolMix8 analog summing boxes, and one ToolMst, master and monitor controller.
Analog Summing Box ToolMix8  Master and Monitor Controller ToolMst  

analoge Summing Mixer with 20 Inputs