Amptweaker BigRock Pro


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After introducing the popular TightMetal Pro™ distortion pedal in 2013, Amptweaker™ immediately received many requests for a two button Rock distortion. With its included Fat and Smooth switches, the BigRock Pro™ can get all the familiar tones from the popular TightRock and FatRock pedals, and many more.

Unlike most distortion pedals with boost, the BigRock Pro includes 2 Boost knobs, one before and one after the it’s easy to boost the gain AND volume, for the perfect solo tone. There’s also a Midboost button that works with the output Boost knob, to help solos cut through the mix. Developed while designing the FatRock 'tweaked' version of the TightRock, the BigRock Pro has a Smooth Edge switch which cuts the high end sizzle for a warmer edge, and 2 Fat switches for either the normal or Boosted tones to have a thicker attack with a bit more compression, like the FatRock pedal.

There's also a High Gain switch to select between Vintage sounding blues rock or heavier modern rock gain. The added three band EQ allows for much tonal variation, with its PlexEQ button for more traditional stack tone. The standard noise gate from the original TightRock is also included, with 2 separate internal adjustments to help tweak the feel of the gate. Amptweaker pedals are known for effects loops, and this one has 3: a universal loop, another active with the boost, and the popular SideTrak loop which activates when the pedal is OFF, to automatically shut off clean effects.

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Technical Specification

Dual Lit Boost controls via Boost footswitch
3 Band EQ, w/ Smooth Edge sw. and PlexEQ sw.
3 effects loops....Universal, Boost with Pre/Post switches, and the SideTrak loop that works when the pedal is OFF! Patch in clean effects
Gain, Tight & Volume Controls
High Gain switch for heavier tones, off for more vintage blues rock tones
Noise Gate switch, with internal adjustment, tracks gain
Added adjustable internal input noise gate for even more gating
Mid switch with PlexEQ setting
Mid Boost switch tweaks Boost to punch through
Internal Fat switches for warmer Rhythm and/or Boost tones
Can be used as a preamp, or into a clean channel
LED lit knobs when using a power supply
Battery disconnect switch with red indicator
Runs on 9V-18V batteries or supplies–like 'variacing' your amp up and down, or similar to 50W versus 100W tone
Current: 18mA with 1 or 2-9V batteries, 22mA with 9V adapter, 24mA with 18V adapter(adapters add knob LEDs....internal switch disconnects 1-9V battery clip
DC Adapter jack, standard 2.1mm X 5.5mm, center ground(-)
Magnetic Battery access door opens w/o tools
Weight: 3 pounds, Dimensions: 5.625"W X 5"D X 2.125"H
Handmade in the USA