The Killer Blue Wail is a bass wah that preserves the tonal integrity of vintage wahs and overcomes their familiar shortcomings, such as excessive noise and unreliable mechanical parts. Light sensor technology means no clunky pops, no scratching sounds and no pots to wear out.

Rather than a simple band-pass or low-pass filter, it uses a specially designed filter that changes not only the frequency but also the Q, the sharpness of the filter. Unlike guitar wahs, it keeps the low end intact. A spring-loaded rocker engages the effect when you press forward and returns to its resting/bypass position when you remove your foot.

• Keeps the low end intact
• Light sensor technology instead of a mechanical pot
• Specially designed filter that changes frequency and Q
• Spring-loaded rocker with automatic engage and return to bypass
• Housing machined from solid billet aluminum

• Dimensions: 3.375" W x 8.0" L x 1.75" H (8.6 x 20.3 x 4.4 cm)
• Weight: 24 oz (680 g)
• Power: 9V alkaline battery (not included) or optional Tech 21 DC9 power supply