Klaus Gramhansen developed the Constant-Q spectrogram feature for the audacity/audacity repository, enhancing the audio processing module with advanced time-frequency analysis capabilities. He integrated a new analysis library using C++ and CMake, ensuring the feature worked seamlessly across Linux, Windows, and macOS. Klaus addressed platform-specific compile issues, improved code formatting with Uncrustify, and resolved unittest build problems to support robust development workflows. By adopting a FetchContent-based approach for the tft library, he simplified dependency management. His work demonstrated depth in cross-platform C++ development, audio processing, and build system integration, resulting in a stable, maintainable feature for the project.