Check the following:
Ã¯ Is the power switched on?
Ã¯ Is the LINE switch on the front panel switched out?
Ã¯ Are the INPUT and OUTPUT LEVELS set correctly?
Ã¯ For microphones that require phantom power (ie condenser microphones), is the +48V switch engaged?
Ã¯ Is something connected to the Instrument input? (This overrides the mic input.)
Ã¯ Are headphones connected? (These mute the monitor outputs - see the article regarding latency-free monitoring)
Ã¯ Is there something connected to insert return?
Ã¯ Is the Optical Expander activated?
If the problem persists after checking these things then please contact us for further support.