1 -| |-4
| |-2
|_|-3
thats kinda what i've seen from search (the bottom being where you put your plug in). i've soldered to all ahha i get nothing.
but i have tried this and got something. i have a lm386 (no resisters) wired up in my computer. the + and - is connected to a headphone plug so i plug that in to a splitter to get sound reactive leds in my computer.
anyways i plugged that into my psp and it works but only at the highest level volume and its still not as reactive as a direct connect.
when i tried no resisters and connection to 1 and 2 i get super bright lights that just stay solid.