Audio distortion, input delay, and doesn't recognize shoulder buttons

[Neverest]

Noticed that VBA-M has some sound distortion, if you want to try it, the game Harvest Moon-Friends of mineral town is a good one to compare the audio with VBA-Next.

There is also some input delay, and the core doesn't seem to recognize the shoulder buttons.

http://xbmclogs.com/prvstqukh

Ubuntu paste: http://paste.ubuntu.com/12610554/

[garbear]

Shoulder buttons fixed by a4b5e54 and cefbc25