This is a 4×4 Matrix Mixer. With four mono inputs and four mono outputs there are many routing options. Each input has four volume controls, one for each output. This could be used to create four unique mixes from mono sources or run the outputs through different signal chains or amplifiers. You can also send an output through effects and then back in on itself to create a feedback loop.
The circuit is completely passive and requires no power, as with all passive matrix mixers there is some gain loss and crosstalk. It is housed in a rugged raw aluminum die cast case.
This will operate in either direction. The knobs can be pulled off and reorientated depending on what works best for your setup. Handmade in Oakland, CA USA.
Shipping inside the US is a flat $10, everywhere else is $22 for the first item and $8 for each additional item.
Ships next day.