One filter has to go to make room for a new Guyatone Ultron. I think the Ultron will sound closest to my EBS Bass IQ, so out it goes. The EBS is a fantastic envelope-controlled low pass filter. It responds well to both active and passive basses. The filter is very articulate. I won't go on and on about it, since there has been much posted already in the forums. I have owned about 10 filters, and the EBS compares favorably. This pedal has a lot of sctratches on the bottom and sides. It functions perfectly. $120 including shipping in the continental U.S. EBS pedals have excellent buffered bypass circuits. They run on 9V. The build quality is very high. They are also very compact. Check out my feedback. PayPal preferred. Other forms of payment OK too. I pack things well and ship promptly. Photos later if needed. If you have any questions, go ahead and post here or send me a PM. I'm on the computer a lot for work, so I can usually respond very quickly.