Wired Headphones: Never use Bluetooth headphones for Guitar Hero. The wireless delay will make it impossible to hit notes in sync with the music.
To achieve "extra quality" performance for Guitar Hero III: Legends of Rock guitar hero 3 ppsspp extra quality
In Guitar Hero , a 50ms delay is the difference between a 500-note streak and a "Stage Failed" screen. PPSSPP is powerful, but audio lag is its Achilles' heel. Wired Headphones: Never use Bluetooth headphones for Guitar
: Using PPSSPP allows you to upscale the resolution (up to 5x or 10x PSP native), add texture filtering, and use custom HD texture packs to achieve that "extra quality" look. Button Mapping PPSSPP is powerful, but audio lag is its Achilles' heel
Increase this to 2x or 3x PSP (or higher if your device allows) to significantly reduce jagged edges.
Here is how to get performance and visuals on PPSSPP: