Auto-Wah - E-Mu 1212M Owner's Manual

5 - Effects
Core Effects Descriptions

Auto-Wah

This effect creates the sound of a guitar wah-wah pedal. The "Wah" filter sweep is
automatically triggered from the amplitude envelope of the input sound. Auto-wah
works well with percussive sounds such as guitar or bass.
The Auto-Wah is a bandpass filter whose frequency can be swept up or down by an
envelope follower, which extracts the volume contour of the input signal. The Envelope
Sensitivity setting allows you to properly set up the envelope follower to receive a wide
variety of input signals. This "envelope", or volume contour, controls the frequency of
the bandpass filter so that it sweeps up and down with each new note. The Attack
controls the rate of the note-on sweep. As the input sound fades away, the filter sweeps
back at a rate determined by the Release setting.
The wah direction allows the filter to be swept either up or down in frequency. Use a
higher Center Frequency setting when the wah direction is down.
Envelope
Sensitivity
Input
Wave
Parameter Description
Wah Direction Allows you to sweep the wah up or down.
Env. Sensitivity Controls how closely the wah sweep follows the input signal.
Range: -12dB to +18dB
Env. Attack Time Sets the starting rate of the "wah" sweep.
Range: 0ms to 500ms
Env. Release Time Sets the ending or release rate of the "wah" sweep.
Range: 10ms to 1000ms
Sweep Range Controls the amount of "wah" sweep. Range: 0% to 100%
Center Frequency Sets the initial bandpass filter frequency.
Range: 80Hz to 2400Hz
Bandwidth Sets the width of the bandpass filter. Range: 1Hz to 800Hz
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Auto-Wah Filter
Center
Frequency
Bandwidth
Sweep Range
Attack Release
Envelope Follower
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