Thank you very much for the tip! Always open to new suggestions. I've actually tried different "virtual cable" options, including VoiceMeeter, in this process. I hadn't tried Reastream yet, and since I use Reaper anyway, it seemed like a great idea. Unfortunately, attempting to load Reastream as a filter results in OBS crashing every time. After searching a lot, I have yet to find a solution that works.
You inspired me to do some more research, and I stumbled on another similar method using Rearoute (another Reaper plugin). Here's the video for that: https://www.youtube.com/watch?v=ANeA0wh ... e=youtu.be
Notice in the comments of the video, someone mentions having to also install the OBS "ASIO plugin". I did that, and sure enough, ASIO became an option in the Audio Capture menu in OBS. The link for that is here: https://github.com/Andersama/obs-asio/r ... ag/v2.0.2b
Using this method, I was able to connect Rearoute to OBS - I was finally getting my DAW audio piping into OBS! Wow! No virtual cable required! Ah but.. there's always a "but". Turns out, I listened back to the recorded video, and the audio is useless! The audio is coming in digitally garbled/distorted. Ugh...
So after playing with every possible setting in OBS, Rearoute, and Reaper, I still can't get that issue resolved. Everything is at the same sample rate of course, but I have a theory that it has something to do with the fact that my Windows and Reaper are 64-bit, but the E-mu Patchmix is 32-bit. The only other thing I can think is that maybe bitrate is an issue. But no setting in OBS or Reaper seems to make the problem go away.
In conclusion, I'm closer than I've ever been to this ridiculously elusive goal that seems like it should be simple to solve. If anyone has any other suggestions, I'm all ears. In any case, I wanted to report back my findings for everyone's information and thank you for your help.