Pop Noise from Audio Out While Using iTunes 9.0.1

I have a black MacBook with Leopard 10.5.8 and iTunes 9.0.1. I have a a pair of computer speakers plugged to the MacBook's audio out minijack. Every time I run iTunes to play my music everything goes fine until I stop the music (you know with the space bar or the stop button). 30 seconds after I stop the music a loud pop noise comes up and stops, as if some electrical device was receiving a charge of electricity. When I play music back again on iTunes, the same noise comes up again with the music and goes away immediately while the music continues all right.
This is what I have done so far:
Change my energy saving parameter to several different configurations (perhaps the hard drive stopping when unused was the cause) but none fix it.
Turned off Airport...did not fix it
I timed the pop noise and it happens exactly 30 seconds after I stop my music on iTunes and then again 30 seconds after music has been stopped unless I start playing the music back again and the pop noise sounds again.
Any help would be appreciated as I use my MacBook to play music sequences for my band (I am the drummer) so the darn noises come through our PA system (and I also tried my small computer speakers and it does the same thing).
Thanks,

I spent a good amount of time reading several discussions. Apple is aware of this issue but no solution as of yet. The popping noise is "normal" behavior and happens because of how the sound system is programmed in the computer.
The solution (sorry for the bad news) is to not use the audio out minijack at all. Instead, get an audio interface that connects to your USB port and then route the output signal from your audio interface to your speakers, headphones or PA system. The popping noise will not sound. I tested it several times.
If the only cable you have is a minijack male type then go to Radio Shack and get adapters. I had to get me an adapter that takes two RCA males and converts them to a female minijack type.
Good luck.

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Track 2, start time 02:46:23
Track 3, start time 05:53:17
Track 4, start time 08:51:55
Track 5, start time 11:54:60
Track 6, start time 16:35:36
Track 7, start time 20:42:61
Track 8, start time 24:43:41
Track 9, start time 27:29:21
Track 10, start time 30:33:73
Track 11, start time 34:20:41
Track 12, start time 36:56:09
Track 13, start time 38:43:21
Track 14, start time 41:43:40
Track 15, start time 44:25:27
Track 16, start time 47:34:53
Track 17, start time 50:22:60
Track 18, start time 53:06:16
Track 19, start time 56:53:69
Track 20, start time 59:59:73
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