I want to send music played by applications like a webbrowser to a DAW. I thought to use the system master output. I use JACK on Windows, and although it's possible with many applications to connect to JACK via native support or JackRouter, I don't know how to receive the system output as a Jack input. In this Youtube video a software called Synchronous Audio Router is used to do this, but I can't find any builds from it and I also wasn't able to build it myself. Are there any other solutions?
Also I am not sure if this is possible using only Jack and no other software. I would be thankful for a hint then.