As small form-factor mix bus with up to 12 inputs and 12 outputs, which can be configured in n-m mixing (similar in thinking to the Modular Moog mix bus). Connecting an output mixes all signals up to that jack (from a previous output jack). The UI clearly shows the signal routing and the attenuation is +/- 100% on each input.
There is a "Direct Injection" input at the start to allow easy chaining of these units if needed. This can be useful for mixing the multiple audio or CV waveforms from an oscillator before the "main" mixing stage, or for controlling the amount of multiple CVs for a module.
Also sold as part of Andrew Macaulay's Switches and Mixers and included in Andrew Macaulay's Ultimate Bundle.