I have the same amp and a Klein as well
Single coil pickups?
try this
http://home.kpn.nl/s.scholten17/rig2.jpgMy Klein is the same as a regular one. a frined of mine put it in a 19 inch rack.
Erwin_ve suggested to roll back on the return of the Kleinulator a bit (about 3 oclock). Use the Klein recovery to control your overall volume.
Also there is a pot inside the amp: the OD trimmer. That's an important feature of this amp. You can do a search on the forum and you'll find some usefull info on where to find it and some tips on the settings. I use 9.30
you could also try setting everything on the amp to 5 (12 oclock) and start tweaking to taste from there.
Hope this helps.
oh yeah one last thing. The volume of the clean channel has an effect on the OD channel as well!