# Wahwah

### From Audacity Manual

Rapid tone quality variations, like that guitar sound so popular in the 1970's.

  Accessed by: Effect > Wahwah...

This effect uses a moving bandpass filter to create its sound. A low frequency oscillator (LFO) is used to move the pass-band back and forth in the frequency spectrum. Resonances accentuate tones near that centre of the band, and as that centre frequency varies the accentuated frequencies vary too.

## LFO Frequency

Sets the speed at which the bandpass filter is swept back and forth.

## LFO Start Phase

The start position of the LFO cycle. This determines whether the bandpass filter starts at its lowest, mid or highest frequencies. Another way to look at it is that it determines whether at the start of the effect the pitch is rising or falling.

## Depth

Determines the range of frequencies that are swept through by the bandpass filter. Higher values will sweep the filter to higher frequencies and so give more variation to the sound quality over a complete LFO cycle. Lower values will give a more constant sound effect.

## Resonance

Determines the degree of resonance in the bandpass filter. Higher values give a more "peaky" effect.

## Wah Frequency Offset

Determines the "base" frequency of the bandpass filter. Higher values will shift the filter's frequency range upwards. To achieve a Wah effect that's in the low frequencies the frequency offset needs to be set to a low value.

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