mGBA core in the Garlic OS 1.4.9 is very outdated, it was built upon source code dated Feb 22, 2022, because of an odd audio issue that appeared, when Black-Seraph tried to compile a fresh version of the core (see the changelog of Garlic OS 1.2.9).

I've managed to fix the issue and compile the core from the latest source code. Along with this core, I also decided to compile the latest gpSP core.

Get them here.

Pay attention, that savestates from the old mGBA core will be incompatible with the new one - the game may not start or may have audio issues. If you have some game you played before the update, launch it using the Start button next time to avoid auto-loading of auto-savestate and load an in-game save instead.

EDIT: the updated mGBA core is slower than the old one (check this Reddit comment for a performance comparison). Enable overclock++ and Threaded Video or use the new mGBA core only for the ROMs/hacks with the issues (e.g. "Hamtaro: Ham-Ham Heartbreak" cannot be played on the old mGBA core), check this Reddit comment for configuration details.