I've been finding it difficult to find some good settings on my amp as of late. It's so hard to EQ and get a good tone out of. For anyone who doesn't know or hasn't read my sig, I own a JCM900 MK III Master Volume amp. I'm really wanting to get a nice heavy tone with plenty of gain that emphasizes my highs.
2005 Epiphone Les Paul Custom
Marshall JCM900 MKIII Master Volume head
Carvin G412T cabinet
Line 6 DL-4
Boss BF-3
Boss CS-3
Boss NS-2
Boss OD-20
Boss PH-2
Ibanez TS-7 (being modded soon!)
^Meh, I don't find that thread reliable.

Threadstarter, I suggest you start playing around with it at the volume you have it at. Try dime the mids and cut off the bass a bit and maybe crank up the treble a bit also. Just start playing around with it...and it will take a while...

But you can always get an EQ.
Co-Founder of the Orange Revolution Club

-Esp/Ltd Ec-1000 w/ BKP Mules
-2-channel Titan
-Oversized Bogner 2x12 Cabinet
-Fulltone OCD
-RMC Picture Wah
-T.C. Electronic Nova Delay
-Larrivee D-03R
If you want to emphasize highs try changing the pickups in your guitar. Epi pickups are...ehhhhhh. Maybe a Duncan JB would help bring out more highs.

Other then that...crank the mids and highs?