Worked on the mixxxdj/mixxx repository to address stability and correctness in external library integration, specifically focusing on the Rubber Band audio processing library. The primary contribution involved fixing a bug in the C++ build system by updating the RUBBERBANDV3 macro within rubberbandwrapper.cpp. This change ensured accurate detection of the Rubber Band library version, allowing features dependent on specific API versions to be gated appropriately. The solution was validated through build and basic testing, reducing the risk of runtime errors. The work demonstrated attention to detail in C++ development and build systems, emphasizing reliability in cross-version feature management.