I wouldn't do it via input FXs, but via normal track FXs.
- Create two tracks in Reaper.
First stereo track with live music input, second track with live mic input
- Create pre-fader send from mic track to the channels 3-4 at music track.
- Set volume fader at mic track to zero (you'll likely don't want this control signal to be heard)
- Add ReaComp to music track, set its Detector input to Auxiliary input, ratio 1:10 or so, some longer attack, longer release (eg. 1.5s) and possibly adjust RMS size to some time like 50ms to avoid jumpy behavior.
- Arm both tracks and enable record monitoring via speaker icon
Michal
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