Got this iconic beat machine in town fora fair price. Battery needed a replacement and all of the 30 push buttons were cleaned with isopropanol. Fader 8 is still flakey.

After that i experimented with the ssm2044 chip and came up with an external control box for both of thi filters.

Cutoff 1,2

Reso 1,2

Env. Depth 1,2