Tech 21 Killer Blue Wail

The Tech 21 Killer Blue Wail is a wah pedal made for bass, part of the company's Killer Wail family of wahs. Unlike a guitar wah, which can pull the bottom out of a bass signal, Tech 21 designed it to keep the low-end intact while the filter sweeps¹. It sits alongside the company's other bass effects, from the SansAmp Bass Driver DI V2 to the Red Ripper, and fits the broader field of wah pedals and bass pedals.

The spring-loaded rocker

The Killer Blue Wail's treadle works differently from a conventional wah. Premier Guitar reports that it, like the Richie Kotzen Signature RK Killer Wail, uses a spring-loaded rocker: "It returns the treadle to its resting/bypass position when you remove your foot and automatically engages when you press forward."¹

For a player, that means the wah is off whenever your foot leaves the pedal and on the moment you lean into it, with no switch to stomp separately. It is a hands-free arrangement suited to parts where the wah comes and goes rather than staying on all the time¹.

Availability

The pedal was announced in April 2025, when Premier Guitar reported that Tech 21 was moving the Killer Wail from Private Stock limited editions into full-scale production in three versions: the Killer Wail v2, the Richie Kotzen Signature RK Killer Wail, and the Killer Blue Wail for bass, with anticipated worldwide availability of April/May 2025¹. Tech 21's own product page for the Killer Blue Wail Bass Wah later listed anticipated availability as August 2025².

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