When you slide that switch one power amp is for mains the other is for monitors and would be controlled by the monitor send. If the send is down thus the difference in levels. When in mono turn up the monitor sends. I'm suspecting the switch that does the routing of the signals. Slide that swith back and forth several times rapidly. Maybe some cleaner.


John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
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