Of course, the easiest way to achieve what you want is running a stereo 1/4th or 1/8th TRS out from your interface into line in or microphone jack on your motherboard. Or your discrete sound card if you have one of those. Then you go to the "Recording devices" section of the sound control panel and check the option to monitor through your main playback device.
May work for you, may not. All kinds of weird problems exist. You can end up with weird chorusing and shit depending on your exact setup. Every hardware setup is different.
It also involves making your bluetooth headphones your main playback device in the "playback devices" section of the sound control panel. Which sucks. No one wants a bluetooth device as their main.
Also, since Motherboards don't have 1/4th TRS or XLR Jacks, you are going to be converting one of the outs from your interface to a spaghetti thin 1/8th TRS, which kind of sucks for sound.
The benefit of that way is there is less latency than using a utility. Any routing utility is going to add latency, and it may even be unbearable if you have a shitty computer. That's added latency on top of bluetooth.
I would be interested in trying it with an optical in, but my motherboard doesn't have an optical in, only optical outs.
You can also obviously achieve what you want by buying other physical hardware and macguyvering something up there. Splitters, converters, patch bays, that kind of stuff.
None of it is worth it for Bluetooth due to the latency IMO.
Originally Posted by Chris
I tried that for fucking ever, including using a separate instance of Rewire and all that kind of shit. Couldn't get it to work with bluetooth. Don't know about Mac though. Have you gotten it to work with bluetooth? I didn't bother asking on the REAPER forums, because none of the DAW makers really take bluetooth seriously due to the added latency.