Stereo Lockhart Wavefolder, dual octaver, Dual CEM 3340 VCO, PT2399 crunchy delay and Different Rungler are among Optotronics most popular products.
Wide range dual VCO
6 Saw Voltage Controlled LFOs
Rungler with two shift registers: SIPO and PISO
voltage controlled delay
Frequency Divider
Stereo Wavefolder
Delayed Twin Oscillator
Touch sensitive Flanger