Sound distortion with de-linked audio

Hi
I'm new to FC Express so I hope I'm making a glaring error and somone will be able to set me straight.
I'm running the latest fuly updated version of OSX on a powerbook (Power PC 1.67ghz with 2gb of RAM). The film clips I'll be referring to are stored on a 500 gb external LaCie drive. The version of FCE is 3.5.1 (with the latest updates downloaded).
The Data is HD video (PAL) recorded with a Sony HVR Z1E. The footage was captured using the HDV1080/50i specification. When it was captured using FCE I selected the "Apple Intermediate Codec 1080i50".
Other than the issue I'm about to describe the laptop seems happy with the workload. All editing operations work without a glitch. Rendering is a touch slow.
The problem is as follows. I want to detach audio from some of the video for use as wildtracks. To do this I've been dragging the clip I want to the Timeline. Selecting it. Clicking the delink button. Selecting the video and deleting it. Just leaving me with the audio graphic.
But when I then play the audio in the Timeline the sound has distorted. You can hear an example of this here: http://www.ewanbailey.com/example1.html
(Just for reference the sound was fine in the Timeline when still running alongside the audio). (nb. What you're hearing is a clapper board then footsteps)
At first I thought that somehow the process of deleting the video had somehow corrupted the audio data. However I find that if I drag the same audio in to the Viewer (where it just appears as a waveform) and then play it, the distort is gone. For reference, this is the same clip played in the Viewer: http://www.ewanbailey.com/example2.html
If it helps, this is a screenshot of the arrangement I'm talking about:
http://www.ewanbailey.com/example3.html (nb. I'm aware that the audio is only carried on one channel - this was a choice in production).
Any help would be greatly appreciated. Thanks.
Ewan Thomson
Power PC G4 1.67ghz 2gb RAM Mac OS X (10.4.8)

Following your thinking, I have tried setting up a sequence and selecting "DV PAL 48khz Anamorphic" from the "Load Sequence Preset" button on the Sequence set up menu. This means when I drag a clip into the Timeline it shows a red stripe at the top, which (I think) means it needs to be rendered. So I render "both" on the "render selection" menu.
This then means that the audio doesn't distort when I separate it from the video. And will behave in the way I need it to.
I know nothing about rendering and therefore can't figure out what this means. I have a nasty suspicion that it may mean that I used the wrong codec when importing the (7 hours) of footage. And therefore I'm going to have to re-render any clips that I want to use, which on a G4, takes an age.
(Or re-hire the camera and re-import the lot. Which also takes forever).
The only work around I can think of at the moment is to edit my sequence without rendering (ie. use the default codec for my footage "Apple Intermediate Codec 1080i50"). Then when it's pretty much set, change the codec in the settings to the one that works, render the entire sequence, then start working with the wildtracks I need to sort out the sound. If anyone follows all of this and knows of another way round, I'd love to hear it.
This may not be your field, but I appreciate your input so far. If you can interpret this at all I'd be in your debt. Also, if there's anyone else out there that picks up this thread and knows what I may have done/be doing wrong, feedback would be greatly appreciated.
Thanks
et

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