It always the high gain, my JVM was ok on clean and great on crunch. The od stuff sounds more “modern” so they say, and I don’t care for it. If you like the amp itself and are ok with most of it, try boosting it. Mitchell Pearrow uses them with great success and knows them very well. His is a stereo set up, he’s a nice guy and will help you if you ask him. Also try the way PP suggested, he to knows these amps and how to rum them, to much gain can kill the sound.