Why am I asked to render my audio (the video part plays fine)

Why am I asked to render my audio (the video plays fine) when my sequence settings look like they match my source media?
is there something I am overlooking?

I have loads of material to look through, so I can't give up on this question, render it all and nest it in sequences or something.


Source (captured with iMovie)

Format: DV - PAL 720 x 576 (768 x 576) DV, Stereo, 48.000 kHz 25fps


FCP sequence settings:

Audio: 2 Outputs
Frame Size: 720 x 576
Vid Rate: 25 fps
Compressor: DV-PAL
Aud Rate: 48.0 kHz
Aud Format: 32-bit floating point
Pixel Aspect: PAL-CCIR 601
Field Dominance: Lower (Even)


Does anyone have any ideas? Please?

Thanks for replying,
and that may be the answer, but the odd thing is that the video plays fine without rendering, and the source file, even though captured in iMovie, is still a standard quicktime DV file no matter how I examine it.


also on a possibly unrelated note, does anyone know why it says I have a 32 bit floating point (in my sequence settings I selected 16 bit audio)?


the plot thickens...