The Carl Martin Rock Drive has been described as a "high end" tube screamer. The unit offers the player more gain than the Crunch Drive and has a more neutral voicing. It works particularly well for getting that classic rock tone. By tweaking the mid and high EQ settings via the unit’s attack and edge controls, many tonal variations can be served up effortlessly. Unusually transparent noise free performance ensures that the natural characteristics of your amp will not be compromised. Features true bypass.