Worked on the increpare/espeak-ng repository to enhance reliability and data integrity within the Wave Generation module. Focused on a critical bug fix addressing data casting in the MarkerEvent flow, the work ensured that marker data passed between components maintained accuracy, particularly under edge-case inputs. By correcting the casting from intptr_t to int, the update prevented potential data loss and unexpected behavior during waveform generation. This contribution involved low-level programming and careful data type handling in C, reinforcing code safety around pointer-to-integer conversions. The changes improved maintainability and reduced the risk of future regressions in the waveform generation path.