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Wah-Wah Plugin by MTG
Wahwactor by MTG is a Virtual Effect Audio Plugin for Windows. It functions as a VST Plugin.
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Wahwactor is a voice-controlled wah-wah VST effect plug-in. The Wahwactor system controls a wah-wah transformation in real-time using the guitar player's voice, more precisely, using the performer's "wa-wa" utterances.

Wahwactor is a two-input and one-output system. Out of the two input tracks, one of the tracks may be considered a control rather than a proper input since it is the one in charge of driving the transformations to be applied to the audio signal. In the context of the Wahwactor, the audio signal is typically a guitar signal and the control signal is a voice saying "wa-wa".

First, the voice signal is analyzed to pick up a meaningful descriptor that, after a simple conversion (shift, scale and smooth), is used as the centre frequency of the wah-wah filter, through which the guitar signal is sent to be mixed with the original.

To work in real-time, the Wahwactor uses a frame-by-frame algorithm (described by this diagram). The voice signal is sampled at 44100 Hz and analyzed using a 2100 sample Hamming window and a 2048 point Fast Fourier Transform. The guitar signal is sampled at 44100 Hz and filtered using 2100 sample length buffers. The algorithm uses a 1050 sample hop size so that we have a 50% overlap in synthesis. This overlap is necessary to smooth the filter phase frame to frame variations.

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