Hey!
Yes, I noticed same low gain with xlr, I managed somehow with vocalist menu...you can have some extra gain there.But is acting really crazy sometime...like you said , is on but nothing happends.Maybe a soft problem.
About buttons, maybe is time to change the microtouch inside the keyboard...is getting ruined preatty fast.I did it with some of mine and is perfect now.I dont think is something about power, is just a mechanical problem.
Vio
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Vio