Not the crispiest of videos but hopefully an informative one.
Our RK-006 iOS app is here:
https://apps.apple.com/nl/app/rk-006/...
And there is also a nice RK-006 companion app by Yurii Zubkov:
https://apps.apple.com/nl/app/rk006-m...
For PC/Mac/Linux: you can also access all settings via a browser on WebMIDI. The web-editor is available in Chrome, Edge, Brave,... (but not Safari..)
https://www.retrokits.com/rk006/setti...
If you need to smoothen out the RK006 PWM Signal to a more analog style voltage we also have the PWM2CV converters for the RK006, to see them in action, also view our instagram posts like this one: / ce7ncbshxjh