Synthesizers Mini Analog Modeling Synthesizer build pt1 2017-04-07 Ninjani Diskus Leave a comment Analog Modeling Midi Synth My one chip Analog Modeling Midi Synth PCB population. I used the 6n135 Optocoupler/Optoisolator because I had bunch of them at home. Next I will design/build eurorack panel for it. dsp-G1 – Manual