Question:

How do I use Subgroups on my Si mixer?

Answer:

First, select each channel that you want to be in the Group and de-select LR and/or MONO on those channels.

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With a post fader Aux mix selected, assign the mix to LR and/or MONO. then bring up the channels you wish to be in the group to unity (0db). Once again, make sure those channels are no longer assigned to LR and/or MONO.

This will create a Group and the mix master is then the Group Master