I have a casio keyboard which doubles as a midi controller, and I want its audio to go through a discord voice call. I don't have an audio-in jack, or else this would be trivial, so I'm going the usb midi route.
My setup so far is Xubuntu 18.04 with qjackctl and qsynth. The keyboard shows up under ALSA in the JACK connections window, and it connects to qsynth just fine. I can hear it through headphones. But now I don't know how to pipe this audio through to discord. Looking into virtual audio cables didn't go very far either.