Wired remote volume control for ClearOne Gentner AP800 matrix mixer

How to use the Arduino microcontroller to remotely control this matrix mixer.

Pneumatic Jack in the Box, Part 3

To support the mask I built a frame out of perforated metal tape. I basically fit each piece into the mask from the inside, then attached the pieces together with small nuts and bolts. The frame was then screwed into a stand made of three pieces of 1x2 wood left over from the torsion box coffin lid project.