Megpoid the music ♯

[nightmesh]

First set up xpadder to response to your controller.
Then open ppsspp and go to controls so you can see the keys that coincide with the emulator.
Then set up the keys for your controller through xpadder. Then exit out of ppsspp and open it up again. The buttons should work now.

Here's a pretty good video tutorial on how to set it up. If you have the newest version its gonna look a bit different but the setup its still the same.
http://www.youtube.com/watch?v=XsXJOsSnk7E