Comment 5 for bug 91500

You're right - I can reproduce this. The clips without background noise work in xine and amarok; the ones with background noise don't in either.

Some people have found a workaround to fix it in xine. It works for me - does it for you?
http://lenrek.wordpress.com/2007/02/15/the-crazy-world-of-media-player-in-linux/
http://ubuntuforums.org/showthread.php?p=2185827

Pasting from that last page:

Open up ~/.xine/catalog.cache in a text editor and find this section:

[/usr/lib/xine/plugins/1.1.4/xineplug_decode_real_audio.so]
size=11300
mtime=1171041406
type=131
api=15
id=realadec
version=10104
supported_types=52494336 52559872 52756480
decoder_priority=5

Bump up the 'decoder_priority' value to 10. That should get audio with Real files working.

I don't understand the details of all this, so make the change at your own risk.

That doesn't sort out the original problem in amarok, though. I'm going to poke around and see what I can find...