How to make a "grip add on" for the psp using an old joystick and 2W, amplified, stereo speaker. (sory for the bad english)
Step 1: you need...
one pair of mp3/mp4/ipod portable speakers
-i prefered to use mp3/mp4 speker because the ipod speakers are much more expensive. these cost 10$, ipod speakers much more.
-try to find speakers with builted in amplifier. placing a speaker directly into to the jack won't be louder than the psp speakers.