Electro Harmonix Nano Bass Balls Envelope FilterThe Electro Harmonix Nano Bassballs Twin Envelope Filter effects pedal has everything you loved about the original Bassballs in a pocket size. The human vocal like sound of its two sweeping filters gives bass a strong presence under leads, or a commanding quality when out front. The resonant frequencies are engineered solidly into the full range of the bass guitar's strongest harmonics. Bassballs will respond to every bass note. The sweep is widely