DIY mini Volca Mixer Development

Brief

Make a small mixer for use with things like the Korg Volcas and other tiny synths.  I wanted something I could just grab and use on the sofa with minimal hassle setting up.  Ideally it should contain;

Spec

A compact mixer with between 3 to 6 inputs
Fits in a 1590BB guitar pedal enclosure
Possible Effects section
Not be too expensive

Keep reading to see the prototypes...