The Carl Martin Rock Drive is a 9V-battery-powered pedal designed to emulate the sound of a hard driven tube amp, responsive to individual playing dynamics without altering the basic tone of the guitar.
The Attack (mid) and Edge (treble) controls give access to a variety of flavours within this type of distortion style, without compromising sonic quality.
The Carl Martin Rock Drive is capable of emulating tones from a smoking Twin to a beefed up JCM 800, without low-string mush or raspy highs.
The Carl Martin Rock Drive is true bypass and features an AC adapter jack.
This is what they say
GUITAR WORLD (USA)
The problem with many distortion pedals is their attitude. Most expect to be used as the main source of your gain-enhanced tone and show little respect for the characteristics of your amp. These Carl Martin pedals don’t assume you want to transform your beloved, saggy AC30 into a spandex-ripping Triple Rectifier. Instead, they simply give you another slice of what you already like.
There’s hardly anything to complain about with these pedals. The Danish designer these are created by Holm Malmquist – certainly knows a thing or two about tone and how to cram it into a little black boxes, so anyone looking to augment or upgrade their pedalboard would do well to take a look.
Guitar Magazine (UK)
This is one of the best overdrive units I’ve heard and a pleasure to play.
This pedal is solid enough to make a weak amp sound like an expensive, hand built tube amp. If you have a nice amplifier already, this pedal will sit out front and broaden your horizons to be wider than you ever imagined possible. The pedal’s got four knobs on the top. These are dedicated to being able to change the Gain, Attack, Edge, and Level. Gain will set a generous boundary for distortion. You will be able to fill your crunch needs with ease. Attack and Edge just act as tonal coloring knobs to ensure that your sound is not polarized. Level offers another volume knob in addition to the one on your guitar and amp. You can really get some juice out of this guy when it’s cranked all the way to 10!