Here is some more information about the different guitar amps that you have access to in our bx_rockrack series of plugins:
Marshall = ENGLISH > 4x12 Celestion G12M/25 "Greenback" Speaker
Mesa Boogie = AMERICAN > 4x12 Celestion Vintage 30
Fender = SILVER > 2x12 Jensen C12N 8Ohm
Orange = ORANGE > 2x12 Celestion Vintage 30
ENGL = GERMAN > 4x12 Celestion Vintage 30