1970s Made in USA Electro~Harmonix Doctor Q.

Get groovy! Envelope filters are a staple of funk and jam bands alike by tracking the dynamics of your notes and opening an envelope at a particular frequency set by the single control knob. These are often referred to as auto-wahs, but they are much more than that. The filter kicks in when the input signal reaches a certain threshold and then sweeps until it tails off. Takes 1/8" power adapter or 9V battery.

*We are a FULL SERVICE shop, in business over 30 years, have a expert repair and Custom Modification department as well as an on-site Custom Shop for in-house mods and custom instrument builds. Guitar Villa, located in Bethlehem PA, is run by musicians, instrument and amp techs and we are here to help you with any product selection or use questions you may have. We can advise on the best value at any budget. We would be happy to give you an in-hand description of any item we list for sale. Contact us for all your questions or needs before and after the sale!