Most original USB guitar controllers (like the PlayStation 3 Les Paul or World Tour guitars) will work when plugged directly into the PS4 USB ports. The console recognizes them as standard legacy input devices within the PS2 emulator environment. Wireless Guitars and Adapters

For the longest track selection in a Guitar Hero -like PS4 PKG, Rock Band 4 with DLC songs is your best official bet, though it requires a disc/digital license.

A USB 3.0 external hard drive or flash drive must be formatted to exFAT. The .pkg file is placed in the root directory.

A file is the standard format used by Sony to install games and software updates on the PlayStation 4 system. When users search for a "Guitar Hero 2 PS4 PKG," they are looking for a modified, homebrew package file.

I can provide specific troubleshooting steps for minimizing audio latency on your setup. Share public link