It looks like you have some good advice here above. I am just wondering if you have setup your guitar to compressor to MT-2 and then to Marshall amp. If so you may want to start as per previous advise get a clean sound first, switch your compressor on, run up attack until there is some compressoin going on say 2:1 as a start (Remember bass usually needs more to stop erroneous harmonics and boomy sound in poor acoustically controlled venues or they funk on everything high compression lots of slap) Now allow about 50% sustain again to start with. With MT-2 OFF you will not notice much, but lets leave it there for a minute. Now go to your amp and drive the channels so you have a warm sound YOU LIKE!! just before an overdrive sound is noticeable and leave amp alone at that position for a minute, back to MT-2 switch on from zero drive, adjust tone so it matches in a "Switch-on switch-off" mode drive the MT-2 until the amp starts working harder and a noticeable overdrive is apparent when playing (oh to make it simple have guitar volume at full). If you get squeel very quickly then there is a problem either batteries guitar actives on pickup, batteries in MT-2 or faulty MT-2 or C/E pedal. If you get a great sound then keep adjusting IN SMALL amounts. remember feedback is sometimes desirable in a controlled fashion this includes distance from amp which way you are facing and your playing technique...most important. If everything is ok play around with the three variables in two pedals and amp always leaving guitar at full volume ...why full volume is the nature "tone" state of the guitar as is treble or bass controls to full 100% position Remember pickup choice for solo or power chords may be a factor as well.