ABOVE: matrix top and front view, BELOW: matrix top and back view
(for a larger image, click on it)
I made this 3x3 MATRIX MIXER following a diagram published by Nicolas Collins in his book "Handmade Electronic Music, The Art of Hardware Hacking," with the purpose of expanding the input numbers and to combine some bend toys I made along with delay pedals.
I used a die-cast aluminum enclosure measuring 7.5" x 4.3" x 2.4" (L x W x D).