Hey, I'm going around posting in various places what helped me get my Rodecaster Pro 2 to work in multitrack mode in OBS. I've been ramming my head against this problem for two weeks and hopefully can save someone else the trouble in the future. OBS version is 30.0.2. I'm copying and pasting the email I sent to someone else, sorry for the weird formatting. This assumes you've followed the instructions on the RODE website and have the asio4all plugin in reaper and the rode asio plugin etc etc. But are not getting audio to work or are getting red x's in the asio4all control panel over the rodecaster sources. From that point try this:
From what I can gather, Rode multitrack HAS to have primary control of the computer's sound, it has to receive audio FIRST otherwise it won't work (even if you turn off "let apps take exclusive control of this device" in windows).
Like I said, when I followed the instructions and went to the asio4all panel within OBS there was a red x over the "output" under rodecaster, I had no access to the multitracks, and OBS wasn't picking anything up. Bummers all around. So first I made sure OBS was the FIRST thing I opened as I know Rodecaster likes to have first and full access to the app it's working in. Still the same thing. I tried changing my computer's audio to Chat and USB 2. STILL nothing. I muted my computers audio, ultimately NOTHING. BUT when I muted the audio I got a MOMENT when it showed me the inputs. This reinforced the idea that Rodecaster wants first and primary access to the sound channels. But SOMETHING got in the way again, but what could it be? I had every other app closed? And then I had the thought, what if multitrack was thinking that OTHER RODECASTER SOURCES IN OBS were trying to "take control" from it? In other scenes of OBS I had created audio sources for usb main stereo output, and USB Chat and USB 2 for NON multitrack mode. So I made a new Scene Collection in OBS that was a blank slate with NO other audio sources, Rodecaster or otherwise, in it and switched to it. VOILA the X's were gone, and multitrack was live. However While OBS was showing the channels it wasn't "capturing" the sound. The meters in OBS weren't moving. So I restarted OBS and BAM! It's working exactly as intended. I now have a channel in OBS for each mic, USB 1, USB 2, USB Chat, SOundpad, and bluetooth.
Also, if anyone is having a similar issue with rodecaster 2 pro multitrack and the DAW Reaper, there's a similar workaround.