TMDCHQ

I have the same question too. I have a prefect direct to PA signal including .A.I.R. cab simulation but the soundou of my 8008 marshall amp is very low. Even when the 8008 is on full volume. When I try to put up the volume I use the CHANNEL VOLUME and the cabs sounded good, BUT when I use the CHANNEL VOLUME my signal direct tro PA is completely distorted. What am I doing wrong?