Right now there's a bug where Recut will output to whichever audio source was the primary system one when it was launched.

So e.g. if you have Speakers selected, then launch Recut, then switch to Airpods, then Recut's audio will continue to come out the Speakers until it is relaunched.

Fix this bug so that Recut notices when the system audio output changes, and updates its own output to match.