Yeah, I also made a request for this here https://forum.islainstruments.com/t/assignable-fader-mute-solo-groups/5091 not too long ago.
But, I actually stumbled upon a way that it’s already possible to create Mute and Solo groups, yesterday. Not sure if it’s talked about anywhere, but:
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Mute and/or Solo all the tracks you want to control at the same time (on any Bank)
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Hit Shift-Mute or Shift-Solo on any track. They previously selected group of tracks will all turn on/off together! The S2400 will remember this selection until you create a different group and repeat the process
You can even individually Mute/Solo other tracks without messing up the group. Just make sure to de-select subsequent multiples before you try to Shify-hit your group again. Also, the Solo and Mute groups can be setup on completely different tracks.