Electro-Harmonix DOCTOR Q Envelop Filter Posted on January 21, 2025 by neworld “Catalinbread Formula No. 55 (Vintage Fender Tweed Deluxe )” has been added to your cart. View cart $50.90 DOCTOR Q Envelop Filter Out of stock SKU: NDRQ Category: Pedals Description Description Official distributor for all brands listed on the site.Free Returns for 30 days – No questions asked .Contact us at anytime calling 305-371-7170 Related products Walrus Aetos 120V Clean Power Supply $169.00 Read more Electro-Harmonix VOLUME PEDAL Precision volume control $91.10 Read more Supro ROYAL REVERB $1,499.00 Read more Supro SUPRO FUZZ PEDAL $199.00 Read more