Check the listing for details. Keeley Neutrino - Envelope Filter and Auto-Wah Effect Pedal. Condition: New. Listed at 352.36 USD. But the Keeley Neutrino comes with a unique extra - a secret switch hidden on the side of the pedal - that reverses the direction of the filter's frequency curve. At the push of a button, the WAH becomes an AU! Depending on the strength of the attack, individual notes become expressive syllables. Chord work cuts sounds straight from the disco lexicon. All of our items have a 30-day return policy without explanation. Notes, reading and software are excluded from the exchange. The General Terms and Conditions of Zoundhouse GmbH & Co. KG apply. When purchasing multiple items: Add the items to your shopping cart and select “Request total from buyer” at the top right. If you intend to buy multiple items: put them into your shopping cart and choose “combined shipping (up right)” on your checkou.