Digitizing the Ibanez Weeping Demon Wah Pedal

Chet Gnegy, Kurt James Werner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)
485 Downloads (Pure)


Being able to transform an analog audio circuit into a digital model is a big deal for musicians, producers, and circuit benders alike. In this paper, we address some of the issues that arise when attempting to make such a digital model. Using the canonical state variable filter as the main point of interest in our schematic, we will walk through the process of making a signal flow graph, obtaining a transfer function, and making a usable digital filter. Additionally, we will address an issue that is common throughout virtual analog literature; reducing the very large expressions for each of the filter coefficients. Using a novel factoring algorithm, we show that these expressions can be reduced from thousands of operations down to tens of operations.
Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Digital Audio Effects (DAFx-15)
EditorsPeter Svensson, Ulf Kristiansen
Place of PublicationTrondheim, Norway
Number of pages8
Publication statusPublished - 30 Nov 2015
Externally publishedYes
Event18th International Conference on Digital Audio Effects (DAFx-15) - Norwegian University of Science and Technology, Trondheim, Norway
Duration: 30 Nov 201503 Dec 2015

Publication series

NameDAFx Proceedings
ISSN (Print)2413-6700
ISSN (Electronic)2413-6689


Conference18th International Conference on Digital Audio Effects (DAFx-15)

Bibliographical note

Runner up for best paper


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  • DAFx Best Paper Honorable Mention

    Gnegy, Chet (Recipient) & Werner, Kurt (Recipient), 30 Nov 2015

    Prize: Prize (including medals and awards)

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