U-Sound Yellow Q



A feature of this pedal is that Instead of the effect being controlled by a foot pedal, as on a standard wah-wah, the effect alters in response to the volume of the input signal. Since the electronic circuits in the effect can respond much faster than a human musician can physically move a foot pedal, certain effects that a standard wah cannot achieve are only possible with auto-wah. The response of the effect is highly interactive with the dynamics of the input signal - this makes it possible to vary the response at will via slight adjustments to the playing technique. Therefore it may take some practice before the response of the auto-wah can be willfully controlled in order to achieve a consistent sound.


  • Sens - adjustment of threshold response effect
  • Freq - depth adjustment a filter
  • Q - quality factor of filter
  • Decay - damping time of effect


  • The pedal gets powered by a 9 volt battery or stabilized 9 volt adapter.
  • True bypass.
  • Dimensions: 115x90x40 mm
  • Weight: 430g

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