"Tim Davis was killed in a motorcycle accident last month. Tim was a gifted musician and an electronics genius. This synth was a lifelong project and hobby of his. It was purchased the year he graduated high school (1972) and has been with him ever since. I included two pics of an original Moog Sonic Six for comparison.
As you can see the main panel has been removed and replaced with clear plexiglass. In the upper portion: fourteen 1/4" I/O jacks have been added on the left side, eleven 1/8" I/O jacks have been added along the top, 32 various switches, buttons and I/O jacks have been added along the bottom. The original speaker was removed and replaced with a panel of 29 dials and a button. In the lower portion 13 various switches, dials and ports have been added and a replacement speaker (marked ELP) has been mounted. There is a hand written label that says 'TYMCLAVIER', I believe this is a reference to the Synclavier Digital Synthesizer. I have a notebook containing hand written instructions on the use of this creation as well as hand drawn diagrams of many of the circuits involved.