Works as expected with Stream To/Renderer mode, but this has the behavior of kicking you out of games/apps as it cannot multitask. I want to use this to stream system audio to the Xbox 360 while playing games, and SWYH is the only solution I can find that supports a Media Player mode. If I choose Songs -> Stream What You Hear (PCM/L16 OR MP3) it will fail with a 04-800705b4 while trying to play in game via the Guide. Using the System Music Player, it gives more specific errors like 19-04-80070032, which seems to imply the system things it's an incompatible stream/codec. I tried messing with various settings like sample rate but nothing will make it function.

https://forum.streamwhatyouhear.com/t/errors-playing-on-xbox/718 the problem is as described here, almost a third of my lifetime ago. If this is user error or a potential misconfiguration, I apologize. If this is a bug, it might be worth fixing, as PlayTo on an Xbox 360 is needlessly restricted.