I think there is a driver compatibility issue with the 1320 and older games like Bejeweled... I often get cracking noises in those older games. Newer games like Angry Birds etc. work fine.
With the speaker. Bejeweled, Bejeweled Blitz and Zuma's revenge. Other games are fine. I think it is a firmware/driver issue. My Samsung Ativ-S also did it with the same games, but less and the problem was gone with the GDR3 update.
Same thing for Bejeweled on my 920, 1020, and 1520. It's not just the 1320. It probably has to do with the way that they are handling audio in their Audio Engine for those titles. My speakers still pop and crack with Bejeweled when it's on silent too.