The Maxon AF9 Auto Filter takes the most desirable auto-wah and swept filter effects and offers them up in a compact, user-friendly package. Opto-coupler circuitry produces the shimmering, watery filtering of legendary vintage units. Threshold and Peak sliders control the degree of effect; while Range and Drive switches determine range and direction of the filter sweep. Three selectable filter types (Low Pass, Band Pass, and Hi Pass) and a frequency range of 100 Hz – 4 kHz allow the AF9 to function with virtually any instrument or input signal.
"The Maxon Auto Filter is one of my favorite "go-to" pedals. This really helps you give your playing a human voice without sounding like you just stepped on an effects pedal. It is really special and you can hear it on tons of my recordings." - Marty Friedman (ex-Megadeth, Cacophany)