TMFX v 1.93 MacOS (3)
RME Thunderbolt Settings Firmware: v112, Driver: v1.05
Fireface UFX+ (23919669) (the old hardware version, I guess: SW Version: 55, Active Nodes: 105
Mac OSX 12.7.2 (Monterey)

Same kind of issue as a previous bug report I've sent to this forum.
https://forum.rme-audio.de/viewtopic.php?id=38815

In TotalMix FX you can set Room Scale in Reverb to a value in the range from 0.5 to 3.0 with a precision of 1/100th, for instance 1.53.
OSC receives all the values for these settings, but the values reported via /3/reverbRoomscaleVal have a precision of 1/10th: for instance, turning the knob 0.72, reports a value via /3/reverbRoomscaleVal of "0.7".

Sending a value of 0.088 via /3/reverbRoomscale, which should equal 0.72 on the knob in TM FX, sets the knob to 0.7.

Thus: the values reported but turning the knob in TM FX are wrong (truncated).
The values sent to TM FX are truncated as well.
Thus it is not possible to store the exact values of the knob in an external piece of software.