The Polygogo has teeth and fold parameters to add harmonics, and it also has a built in FM modulator. There are lots of synthesis options in the Polygogo and the screen is always giving you feedback on what is happening with your sound.
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What is a stereo polygonal oscillator? The E-RM Polygogo uses this form of synthesis developed just for this module. The screen shows a visual representation of the sound that the oscillator is generating. When smoother shapes appear on the screen the sounds are more calm and when there are lots of particles and jagged lines moving around the screen some harsh timbres come out of the oscillator.