Playback problems LE 6 on 2.4GHz MacBook Pro

After installing Cubase LE 6 on a 2.4GHz MacBook Pro (2010) and trying to playback the demo, I find that the file plays really choppy and jittery…any ideas to correct this?

Do I need more memory? Is there an issue with Cubase on MacBook?

raise the soundcard buffers…?

OK… how do I do that?

usually in your soundcard’ s control panel.