"Serial number
Block one 500406
Block two 500402"
EVERYTHING SYNTH
on Coagula here "In another post I wrote about the Gakken SX-150, now I explain how I created a "giant" controller (50cm) for this mini synthesizer, but in order to make this change I had to first understand a little more about the original control system. The strip on the Gakken SX-150 is simply a resistor of about 75 Kilohom. Looking at the schematics I found on the Matrixsynth blog I could think for an alternative to the control system of Gakken...."
via this auction