UI24R SUBGROUP to MATRIX, Mute button and Fader of the SG don't work.
When sending something sound from a SUBGROUP to a MATRIX bus, neither the SUBGROUP fader nor the MUTE button never work against the sending to MATRIX.
I'm not sure if this is what Soundcraft expected.
MUTE and FADER do not work for the sending to matrix regardless the state of this SUBGROUP PreProc or PostProc switching.
Personally, I think it's rather convenient when using it as Channel to Matrix, but I felt strange that even Mute button didn't work, so I think it might be a problem for other guys.
Now I am just reporting it here.
Personally, this specification is not a problem as it is.
Nevertheless I think it is better to mention about this work in the user manual.