Godlyke Inc. | 1 decade ago

http://www.godlyke.com/maxon-guitar-effects/maxon-nine-series-effects/auto-filter

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.

Video by Andrew DeRoberts - facebook.com/andrewderoberts