afaik they are mostly discouraged because of the various challenges coming with them (like zero crossing at high amplitudes, capacitance, etc), but it's not like it's impossible to deal with all of that.
According to their blog posts it was a contract work by another company: https://feinarbyte.de/projekte/stompenberg/ (german site)
There's also a video showcasing this project over at their synth channel at youtube: https://www.youtube.com/watch?v=1lBYRQUTzYk
afaik they are mostly discouraged because of the various challenges coming with them (like zero crossing at high amplitudes, capacitance, etc), but it's not like it's impossible to deal with all of that.
According to their blog posts it was a contract work by another company: https://feinarbyte.de/projekte/stompenberg/ (german site)
There's also a video showcasing this project over at their synth channel at youtube: https://www.youtube.com/watch?v=1lBYRQUTzYk