PM4x4: 4x4 passive matrix mixer (14HP, prebuilt - black hardware)

A re-release of one of my older modules - a 4x4 passive matrix mixer.

For those not in the know, a matrix mixer is a device that routes multiple input signals to multiple output destinations. It allows for flexible and complex routing of signals, enabling users to create custom mixes and effects chains.

Unlike a traditional mixer, which typically combines inputs into a single output, a matrix mixer provides individual control over the routing and mixing of each input to each output.

TL;DR - you can do funky mixing effects with it.

Note that as this is a passive mixer, meaning that you won't be able to generate feedback and other squally effects using the module on its own (you'd need some external amplification for that) but it's still good for taking up to four sources, mashing them together and then sending them to up to four different destinations.

Note also that as this is a passive device there's a considerable tradeoff between mixer resistance value and voltage drop/channel crosstalk. I use 10k resistors by default - if this bothers you then you're probably better off picking up the PCB/panel set and rolling your own with larger resistors.

Inputs are capacitively coupled (ie. any DC offset in the signals will be removed) 

This is a pre-built version of the PCB/panel set - I'm only making a couple of these available so get 'em while you can; PCB sets will continue to be available. Note that unlike the photo, this module has black knobs and pot hardware, not grey/silver.