Set this to Low . If the audio crackles, move it up slightly, but keep it as low as your hardware allows to ensure the music matches your button presses.
Increase this to 2x or 3x PSP (or higher if your device allows) to significantly reduce jagged edges. guitar hero 3 ppsspp extra quality
for a balance of sharp visuals; high-end devices can push to for HD-level clarity. Upscale Type & Level Set this to Low
, you should focus on increasing the internal resolution and implementing high-definition texture packs. Since the original PSP resolution is quite low ( move it up slightly