I recently picked up two of these Grass Instrument Co. Click-Tone Control modules. These units have 1994 date codes and still work. From my understanding these would be used to provide test subjects audio stimuli for studies involving things like rhythmic auditory–motor entrainment, but I want to try to get it to make some music. The port on the back of the unit allows you to remotely control the output. I am hoping I can make some sort of sequencer for it and experiment with some of the internals. After briefly looking at the board it appears to be based on a pair of XR 2206 IC Waveform generators.

Please take care of each other.