Please check that the Outlevel in the Effects, Out block doesn't have a small black box in front of the value and that the value isn't 0%. (The small black box indicates that the value is controlled by an external controller). Please check your settings in the I/O Setup, Control; G-Force control: Main Vol. You should not set it to pedal if you don't have a pedal connected. If you still don't have output: Please perform a self test. Click here
for instructions on how to do that.