Storms can't play 2 sounds at once?

I have a 9550 and my buddy has a 9000. I noticed when he plays Pandora or media player and he has a notification come in, his music does not stop and plays through the music. But on my 9530 and 9550, the music stops, plays the notification, and then starts up again. Is this just a Bold thing or am I missing something?

my 8220 will stop the music allow the notification and than return to playing while pandora is playing.