: This is the most critical step. Since the PSP lacks a guitar peripheral, you must map the Green, Red, Yellow, Blue, and Orange frets to the PSP buttons (usually D-pad and face buttons). Optimized Settings for PPSSPP
Some fan communities have created "CSO" versions (compressed ISOs) that are optimized to run smoothly on the PPSSPP emulator. These often include custom song lists and modified menus to mimic the console experience. How to Install and Set Up guitar hero 3 ppsspp
A popular Spanish homebrew clone of Guitar Hero coded specifically for the PSP. : This is the most critical step