One possible solution for people:
I had a problem getting the audio coming back from RYTM via Overbridge to be in sync.
I use the Reaper DAW, with the Overbridge plugin sending MIDI to RYTM and receiving audio from RYTM on the same Overbridge plugin track, audio input which is then sent within the DAW as separated drum instrument tracks to 8 different audio tracks for recording. (this separated audio routing may differ between DAWs, it wasn’t obvious in Reaper but someone on this forum shared a Reaper session file that made it clear)
Overbridge is great for separating drum tracks to record in this way.
However I was having a problem that my audio coming back and being recorded was 30ms late and no amount of negative offset in MIDI note send of any different technique solved it.
What seemed to solve it for me was turning off the Analog RYTM as a USB MIDI input/output in Reaper MIDI settings. So as far as the DAW Reaper is concerned the only connection with the RYTM is through the Overbridge plugin on one track (sending MIDI and receiving audio / MIDI ).
This is actually what the Overbridge manual says, maybe this will help some people because it’s a little counter-intuitive but makes sense: You don’t want the DAW sending info to the Elektron device twice.
I still have audio running in and monitoring out of my main USB audio interface Steinberg UR44C, which I can set an offset if needed but this is a separate thing. I also have other USB MIDI devices running in and out syncing with the DAW clock, separate to Overbridge.