Strange sound problems with NES app.

[Drunken]

So, whenever i play some game with the NES emulator, the sounds are very weird, Like in Super Mario Bros 3, if i jump, the music and the jump sound get all messed up, sounds horrible, and sometimes it even lags the game a little.

Does anyone have same problem, and would it help if i changed the sound settings in the NES emulators settings?