Xvive Acoustic Guitar Knob (V17 Singing Autowah) Singing auto-wah is a double peak envelope swept filter that can be used with either a bass or a 6-string guitar Singing auto-wah kick's it up a notch with a staccato function that is ideal for fast picking, funk bass and tight rhythm guitar. The staccato circuit enables an auto-reset envelope that listens to your playing and quickly discharges The envelope between your notes. This crafty circuit enables incredibly responsive envelope performance, even during rapid Fire playing The fast and slow settings of the toggle switch determine the initial filter upsweep time when a note or chord is played. In the slow Mode it sounds just like a wah-wah foot pedal is being used. In the fast Mode, it is more like past auto-wah designs (such as the ehx bassballs) where the upsweep is fairly fast and the decay time is much slower Cool, funky, twangin wah tones created with single note solos, quick auto-reset envelope for even rapid Fire playing Micro pedal package - very small and compact, durable all-metal housing