Nowadays, it's rare to find an oscillator that uses the new synthesis technique. Polygogo not only uses an innovative, so-called polygonal synthesis, but also displays the sound being made, almost stunning the user.
E-RM thought through all the details and created an instrument that fits seamlessly into a modular setup, has a great sound, a great interface and a lot of surprises.
Paper about polygonal synthesis:
https://quod.lib.umich.edu/cgi/p/pod/dod-idx/continuous-order-polygonalwaveform-synthesis.pdf?c=icmc;idno=bbp2372.2016.104;format=pdf
Great tutorial by @loopop:
https://www.youtube.com/watch?v=ufBeolCjWSw
Timeline:
0:00 Intro
0:29 POlygonal synthesis
0:57 Quick guide to parameters
3:11 Patch 1
3:40 Patch 2
4:32 Patch 3
5:58 Patch 4
6:59 Patch 5
8:27 Patch 6
9:45 Patch 7
12:11 Final Thoughts