Now turn up the volume as high as you can without getting distortion.
You should get pretty close to the top.
Then turn up your loudness setting up as loud as you can without distortion.
lastly turn up the amps.

But... how would you know if you are getting any distortion if the amps are at zero?

As was stated, turn the empeg to 0dB (I recommend disabling and + numbers in emplode) and then turn up your amps until you get to either the max volume you would ever want or to the initial point of distortion.