I bought this to try effects and really just like the sound of my basses without . Works perfectly and is in like new condition . $40 shipped . The Mooer Sweeper Dynamic Envelope Filter works for either bass or guitar and puts a new spin on your sound. The simple controls and compact size make it a great addition to your pedal board. Its full metal casing makes it durable and road ready, and like most great effects pedals it has true bypass.