During April 2025, Witwald contributed to the audacity/audacity repository by improving the numeric accuracy of signal processing routines. He addressed a bug in the Hamming window derivative calculation by replacing a static coefficient with a dynamic computation based on the number of samples, ensuring consistent accuracy across varying input sizes. This change eliminated hard-coded assumptions and reduced the risk of miscalibration, enhancing both robustness and maintainability. Witwald’s work involved C++ programming and algorithm development, with a focus on signal processing. The update provided clear commit traceability and improved the reliability of derivative calculations for diverse audio segments within the project.