Audio will slow down with speed change, but not speed up

I'm using FCP 6.0.6 and am trying to adjust the speed of an audio clip and some odd things are happening.
If I change the speed of a clip to, say, 130%, the clip shortens appropriately, but the audio don't change. It just crops it off. And in the speed dialog box, the drop down menu is grayed out and Constant Speed is chosen.
If I choose to slow down the clip, to say 75%, everything seems to work. The audio is slowed, the clip lengthens, but then I can't change it to anything else. It says slow regardless of any adjustments in the speed dialog box. I have to go back through "Undo"s to get it to change.
Am I doing something wrong? I read some questions about this with people using FCP 7 and that seems like how mine should be working.
Thanks in advance,
Mark

Well, it is an .AIFF file converted from .WAV in Quicktime. It is 187.5 megs and has a datarate of 344.5 k/sec. It is stereo at 44.1K and has a 32-bit Floating point.
That help? I actually just was able to do the time compression in Soundtrack Pro. But I'm sure I've done it in the past directly in FCP.

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Audio will slow down with speed change, but not speed up

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