Yes, this is a \"how\'d they do that?\" question.

The link below is a very good quality recording of the excellent theme from 24 (for some reason the person who recorded it left the logo music in)

Downloaded it? Good. Hear that percussion thing going on... what IS that! and, how could I do that! lol. It appears to change throughout the whole piece instead of it just being a normal loop. Im a newbie with lots of questions, but this kind of percussion stuff really bugs me not knowing as this isnt the first piece that has got me asking.

Help anyone?