Wave Processor


If you’re looking for vintage guitar-synth sounds, the WP-20G Wave Processor is for you! This compact pedal gives GK-equipped guitarists six synth-type waveforms plus modulation and delay effects.

Cool Synth-Type Sounds

If you’re looking for something different, or maybe you lust after those vintage guitar-synth sounds, the BOSS WP-20G Wave Processor is for you. With a choice of six different waveforms like Saw Lead, Square, Ring Mod, Slow Gear and more, all it takes is your GK-ready guitar to create a tonal powerhouse complete with old-school knobs.

Onboard Modulation and Delay Effects

In true vintage fashion, the WP-20G provides 11 different kinds of chorus and delay, which can be turned on and off using one of the two built-in pedals. These effects are great for modulation and doubling, while additional tonal control is provided by a Color knob. And with the WP-20G’s Level knob, you can blend dry guitar with the effected sound to your liking.

*Note that optional GK-2AH pickup or equivalent required for use on both models.


If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.

Support Documents

  • BOSS Guitar Effects Guidebook

    BOSS offers an extensive selection of guitar effects that can be used by guitarists to get any kind of sound you can imagine. Here's a quick reference guide to the type and function of each unit.