basically use the cue/ pfl 2 make sure that each channel is coming in at the "normalized level" (meaning the best signal 2 noise ratio)...
in simple terms just solo/ PFL/ cue each channel one by one..
look at the levels, there u'll find the input level as mentioned on the above post.. try 2 make it sit close 2 the 0 db on the levels (use the channel gain/ trim pot 2 achieve this), If the channel is already coming in to hot just use the PAD Cut (a switch that atenuates the input -normaly by 26db- b4 the gain/ trim/ pré-amp stage)... the master should always b at 0db (normally this means the max volume)... Make sure u connect yer monitors on the monitor out and the tape/ Dat/ Cd on the master out... the master is 2 b at 0db the volume u hear is to b controlled by the monitor level pot on the mixer.
Now if u want a "phat" overdrive just make sure the input goes over the 0db.. the more it goes the bigger the overdrive u get...
hope this was simple, helpfull has u neaded,
Z