Demonfx DH4-2 Preamp and Overdrive Based on the Diezel VH4-2 VH4-2 is described as follows: James Hetfield (Metallica), Adam Jones (Tool), and Neal Schon (Journey) are just a few of the names that have found their signature tones within the fire-breathing tubes of a VH4 head?s legendary third channel. With the VH4-2 preamp/overdrive pedal, Peter went to great lengths to faithfully reproduce that exact same tone and feel, allowing you to place it snugly on your pedal board. But he didn?t stop there. This pedal?s two foot-switchable channels - carefully voiced for rhythm and lead tones - as well as its ability to run in front of a clean amp or directly into a power amplifier effortlessly turn any clean amp tone into a massively versatile high-gain monster. The VH4-2 preamp/overdrive pedal unleashes one of the most important high-gain tones in history with the tap of your toe. The VH4-2 recreates VH4 amp channel?s magical blend of aggression, clarity, and full-throated punch. Plug in a VH4-2 and turn your amp into a raging VH4 stack. PEDAL CONTROLS Bass, Middle, Treble: Shapes the EQ and adjusts the overall gain. Deep: Increases the ultra low frequency content - simulating the DEEP control on the VH4 amplifier. Presence: Contours the high frequency content - simulating the PRESENCE control on the VH4 amplifier. Master 1 2: Adjusts the overall volume of the pedal. Master 1 for channel 3 of the VH4, and Master 2 for channel 4. Gain 1 2: Adjusts the amount of gain for the pedal. Gain 1 for channel 3 of the VH4, and Gain 2 for channel 4 of the VH4. Guitar input: Connect your guitar to this input. Out to guitar amp: Connect to the front end of your amplifier. Out to power amp: Connect to rack mount power amplifier or the return jack of your amp?s effects loop. 12-18V Center Negative SPECIFICATIONS ? Weight: 1.4 LBS ? Dimensions: 4.5" W X 6.5" L X 2" T ? Preamp pedal based on the Diezel Herbert ? Foot-switchable Mid cut circuit ? ***** Pedal can be powered between 12-18VDC ***** (no battery) ? Power draw 100mA