[LAU] Need some Ideas for a streaming helper ...

Hi! So, i recently started streaming a lecture. The institution uses Discord as a platform. Using a strange mix of PulseAudio and JACK, i managed to get a configuration running where I could stream my voice and the media from my slides (slides were presented using chromium). The problem is that discord seems to have some form of compression/auto-gain that can't be turned off ... so to hear the sound from the videos (the quieter parts especially) I had to crank them way up. But then, my voice was suddenly way to low in volume. So, my idea would be to have a mixer in JACK that allows me to mix my voice and the streaming audio before it goes into discord (via the PulseAudio JACK Source), and in addition allows me to put a compressor on the mix so that the streaming audio and my voice will be at a good level. Does anybody have a hint what could be a good tool here ? Best, Niklas