The standard Reaper OSC string n/master/volume should give OSC feedback.
There are various Reaper options that can be seen in, and are (sort of) explained in the default .ReaperOSC file e.g. REAPER_TRACK_FOLLOWS and DEVICE_TRACK_FOLLOWS. Are they set for the desired behaviour and if not experiment with the different allowed values?
One could also use OSCII-bot as a diagnostic tool to observe the OSC strings being sent TouchOSC <-> Reaper to isolate any issue between the Reaper or TouchOSC ends.
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