You had mentioned in another thread that if the levels were set correctly on the GT-10 there really was not much tone loss.(with 4 cable method) Overall playing with the GT-10 in the store with basic functions and such, the unit is very easy to use but I did not get into level setting. How difficult is it to correctly set levels on this unit? I have read from many frustrated folks on other forums having difficulty setting levels. Thanks, any input would be appreciated.