This control signal then travels to a series of two photocouplers. The control circuit is shaped by the Sensitivity pot and amplified by an Op Amp. The AF9 starts with a unity gain buffer Op Amp and then splits the signal into control and effected circuits. These items aside, the basic structures of the two circuits are very similar. In addition, the III had a Gain pot which controlled the output level of the pedal as well as the Threshold of the Filter – this was an awkward design, as it prevented increasing the filter sensitivity without raising the output volume of the pedal. The biggest difference between the two circuits is that the AF-9 runs on a single 9V supply while the Mu-Tron ran at 18V.
The AF-9 is Maxon’s version of the venerable Mu-Tron III envelope filter circuit (original version, not HAZ reissue). It is really special and you can hear it on tons of my recordings.“ – Marty Friedman (Solo Artist, ex-Megadeth, Cacophany) TECH TALK:
This really helps you give your playing a human voice without sounding like you just stepped on an effects pedal. “ The Maxon Auto Filter is one of my favorite “go-to” pedals. 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. Threshold and Peak sliders control the degree of effect while Range and Drive switches determine range and direction of the filter sweep. Opto-coupler circuitry produces the shimmering, watery filtering of legendary vintage units. 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. While change may be inevitable, if it ain’t broke, then don’t fix it. So, you can expect the latest version of this classic quacker to stand up to the original.
#Maxon auto filter update#
While these changes may have been necessary, Maxon saw no reason to update the AF-9’s classic, watery, 3-dimensional filtering that so many players have to come to count on over the years. This change was made out of necessity due to the discontinuation of the fader pots that had been used on this model for nearly 40 years (original release date was 1981). Specifically, the Sensitivity & Peak faders have been replaced by rotary pots and the slider switches are now toggles. You may have noticed that the Maxon AF-9 Auto Filter has undergone a facelift. Low Pass, Band Pass and High Pass filters.Optical Envelope Filter ala’ vintage Mu-Tron III.Knowing she was released in 1984/85, is now a vintage pedal, and I do it again this choice without hesitation.Maxon AF-9 Auto Filter Effect Effect Filter Made in japan The price / quality ratio is excellent because I bought it less than 100 €. I've had two weeks, and I love the sounds you can get. STORAGE MODE - HIGH / LOW serious (100Hz - 2kHz) for a bass.įor my part, I'm using it with a guitar, and the record is very good. We can use this pedal with a guitar or bass-cf. STORAGE MODE - HIGH / LOW means the frequency range between acute filtered (200 Hz - 4 kHz) or severe (100Hz - 2kHz). PEAK increases the center frequency of the effect, to emphasize the wah effect, as does the resonance filter for a synth.įILTER MODE - HP / LP / LP selects a respective high-pass filter (cut the low frequencies) / bandpass (high & low cutting frequencies allowing only the center frequency of the effect) / low-pass (cutting the high frequencies).ĭRIVE MODE - UP / DOWN directs the center frequency of the effect in the upward direction, UP mode down, DOWN mode.
#Maxon auto filter manual#
The configuration is not complicated, and the manual is clear with examples of settings.Įditing sounds is it too easy when you read the manual.Īs its name suggests, the SENSITIVITY control adjusts the sensitivity of the auto-wah, you add +, + filtered frequency range widens. Audio Connections: IN (input jack) / OUT (output jack).Īlim.
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