I have two identical microphones plugged into my StudioLive 32s via XLR, channels 23 & 24. The mic on 23 shows the word "PreAmp" on the PreAmp gain switch on the Channel Overview screen. The mic on 24 shows the words "Line Gain" on the PreAmp gain switch on the Channel Overview screen. This mic is much hotter than the mic on 23. Please advise on how to get rid of "Line Gain" and have "PreAmp" back (like every other channel on my mixer).