Check the listing for details. Used Electro-Harmonix EHX Bassballs Twin Dynamic Envelope Filter Effects Pedal. Condition: Certified - Refurbished. Listed at 70.99 USD. Used Electro-Harmonix Bassballs Twin Dynamic Envelope Filter Effects Pedal.Mint, with all original packaging! Orders placed before 12:00 PM Eastern Standard Time will ship same day! Orders placed after 12:00 will often ship same day as well, if not, they will ship next day.International orders: Please note that you will be responsible for any applicable customs fees or import taxes!Check my feedback and bid with confidence! Not one, but two narrow filters sweep your tones under control of the envelope, generating very unique vocal-like sounds. A distortion switch enriches the harmonics. The response control varies the sweep range determined by your attack. Not only designed for and great on bass guitar, but also very funky on guitar. True bypass Tough and compact die-cast chassis 9-volt battery included Optional 96DC-200BI power supply available