Hi Jonny
When I was messing around with audio settings a while ago I noticed this. It seems to me that it isn’t a problem with the audio settings – your sequence will be at whatever sample rate and depth you choose in the sequence settings (you can access this dialogue box by highlighting the sequence in the browser and pressing Apple-Zero).
It simply seems to be that FCP always displays a sequence as being 32 bit Floating Point in the audio format column of the browser, irrelevant of what bit depth it actually is. Therefore, rather bizarrely, the browser isn’t displaying the information it claims to be doing, which is a tad misleading if you ask me. However, have faith. The sequence should be at the bit depth set in the settings and this should become apparent when the sequence is exported. I just tested this out now and it seems to hold true.
Thank goodness this only applies to sequences and not to clips otherwise we’d all be properly confused.
John