Bit rate changes from 16 to 32 when resampling...why?

Hello,
I have a few DV Pal Quicktime Movies which have an odd sample rate - slightly above or below 48Khz - this is a problem with the camera which I know about.
So, I open the clip into Soundtrack 1 and resample to 48Khz then click on Save (not Save as) - this saves the corrected audio into the clip.
It also changes the bit depth from 16 to 32 bit which FCP doesn't like - does anyone know why it does this and how to stop it from doing it?
If I do other things such as removing background noise and click Save it keeps the 16 bit depth so I can't understand why it changes it to 32 bit when resampling.
The workaround is to Save As a Quicktime movie with 16bit selected or just bring in the AIFF from FCP but I'd like to know why it changes the bit depth if I bring in the whole clip.
Answers much appreciated.

This is very interesting isn't it !
I have had a similar problem in porting audio between STP & Pyramix, a PC based DAW - often files that I have exported from STP will be recognised as 32 bit files in Pyramix, resulting in gross distortion, and a totally unusable file. This is most frustrating.
I really have no idea what is happening, but believe it must be to do with the way STP handles audio. Another observation is that if you look at a .STAP file in windows explorer, you will see some interesting things - mainly that it is not a "file" more of a directory, containing for example:
a) the audio file
b) an effect file (if you've got some effect on it, or have spliced it etc)
c) a Metadata file
d) and a render file
Perhaps this has something to do with STP wanting to change the wordlength of the audio that it is handling ???
Anyone ???

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