Hello Massy!
I've looked it up in the drumkit I'm using. Edit your XML file, look for the
entry for the hihats and add the command:
<muteGroup>0</muteGroup>
In my hydrogen file it's just above the <layer> tag. I suppose if you need
you can have more muteGroups continuing at 1, 2, ... good luck!
Warm regards
Julien
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