Set this to at least 3x or 5x PSP . If you have a flagship device, go for 10x to eliminate every jagged edge.
: These mods often include the full GH3 career tracklist, featuring iconic songs like "Through the Fire and Flames" and "Welcome to the Jungle". Visual Enhancements guitar hero 3 ppsspp extra quality
The "Extra Quality" tag often implies upgraded visuals. You can actually replace the original PSP textures with high-definition versions within PPSSPP. Set this to at least 3x or 5x PSP