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Audio Routing

Internal audio routing on computers seems to generally be a pain.

Mac OSโ€‹

The best option Iโ€™ve found for Mac is Loopback. Itโ€™s easy to use with a drag-and-drop interface and seems to allow you to connect any source to any destination, including virtual destinations. The only drawback is the price; as of February 2023, itโ€™s priced at $104 USD, however this seems like a valuable purchase if you need to be able to do this.

For Intel-based Macs, Soundflower is an option. It was originally developed by Rogue Amoeba (the same company who makes Loopback), but was open sourced.

BlackHole Audio Loopback Driver gives you a virtual audio cable to route to. This can be useful for some things, however your app must be able to route to different outputs, and not all apps support this. Spotify, for example, will only route to your default output.

Elgatoโ€™s Wave Link software offers some of this functionality too, but requires hardware.