Adds foot-switchable expansion control and tremolo to Two-Rock's best selling Studio Pro series that is known for its extraordinary clean headroom. The new expansion control allows an adjustable EQ bypass to the clean channel. This expansion function increases the amount of gain on the front end. The package comes in a new medium-sized chassis, available in 22W-35W-50W combo and head with 6V6 power tubes on the 22W versions, 6L6 on all other versions. Combos come stock with 8 OHM Celestion Creamback speakers with optional 12-65B available, and Celestion G12-65 upgrade available on request.