Check the listing for details. TC Electronic Ampworx V550 Preamp Pedal. Condition: New. Listed at 139.00 USD. Cop the Sound of a High-gain Classic Latter-day Van Halen tone in a box, TC Electronic’s V550 Preamp harnesses the power of Ampworx technology to precisely emulate a revolutionary tube amp from the early 1990s. Like its fellow Ampworx siblings, this pedal boasts a versatile 2-channel design, giving you access to two distinct voices: a lower-gain “Green” channel and the all-out, arena-shaking high-gain shriek of the “Red” channel. A 3-band Low/Mid/High tone section and Gain/Level/Reso knobs function independently depending on your selectable channel, allowing you to carve out each of the V550’s two voices to perfectly suit your tonal taste. And if you need to add just a touch of extra impact to a key lick or solo, a quick stomp of the dedicated Boost switch cranks up your signal by 5dB.