I used an old top boost years ago. Same one Jeff Beck used when he played an SG through an AC30. That combination needed it.
Les Pauls vary a bit in their tone. Older Customs were all mahogany bodies and had that rather dark sound. Most others get better top through the Maple cap. His Gretch is probably quite bright and that would make him cut through everything. Ideally he should take it down a bit for your breaks but I'm thinking an EQ would do you better service than a treble boost which could just double the 'clang' factor.
Brian
_________________________
I pick up my guitar and play
Just like yesterday
Guitarist with The Silver Hoarde. Geriatric Metal for your weddings and wakes.
