PCB for 2-channel mixer with gain control (6HP)
The MIX2 is, as it's name might suggest, a two-channel mixer - think of it as a cut-down version of the MIX4, which it is.
This is available as a PCB only, so it's up to you to source components, do the build and mount it behind a suitable panel. It's 100% through hole and there are no wilfully weird components unless you count the Alpha illuminated faders.
The board is 25.4mm wide, meaning that it'll sit nicely behind a 6HP panel - you could try 5HP but clearances either side will invariably be a bit tight (the design files are for a 6HP panel)
You can find the schematic, BOM and panel files in the bitbucket repository here.