Mastermind and Grouping

If you're talking about IA grouping, that means that only one button in the group can be activated. This only has an effect in IA mode, where the bottom five buttons send CC messages instead of changing presets.

Let's say you turn on grouping for IA buttons 1, 2 and 3. Let's also say that IA 1 is turned on. Pressing IA2 will turn on IA2 but will also turn off IA1. Pressing IA3 will turn on IA3 and turn off IA2. This is typically used when controlling channel switching on an amp - only one channel can be active at a time, so only one button should be active.
 
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