As with Aux mixes, would it be possible when selecting a subgroup with the Mix Keys to control channel levels into that group using faders?
This would appear to be a basic and effective function and was invaluable on my first digital board, a Soundcraft Si Expression.
No, then you would use the Sub group as an AUX mix.
If it is because you need more AUX’es, just change the numbers in the setup.
In a Sub you change the channel levels by changeing the faders of the mix, just like on a Sub in the Analog consoles.
the name subgroup says that it only can route the signal (routing on or off)