During February 2026, Jeff contributed to the mamedev/mame repository by focusing on audio fidelity within the MAME emulator. He identified and corrected a typo in the SP0250 coefficient table, a change that restored accurate sound processing for SP0250-based titles and reduced related bug reports. Working primarily in C++ and leveraging his expertise in audio processing and embedded systems, Jeff delivered a regression-safe patch that improved emulation correctness without impacting other subsystems. His work demonstrated careful low-level debugging and precise code management, resulting in enhanced compatibility and a better user experience for those relying on accurate sound emulation.