Converting sample rate when exporting

CS5.5
I'm using Audition to do some final mastering to 16-bit stereo 44100 wav files, in 32 float multi-track sessions.
All I'm doing is increasing the clip gain, then exporting to 16-bit stereo 44100 wave and 320 mp3.
I'm not changing the sample rate, channels or bit depth, but I am applying triangular dither when exporting.
The thing I've noticed is even though I'm not changing any of the properties of the files, when exporting Audition still tells me its "converting sample rate", despite the sample rate being the same as the source (44100). The quality advanced tab on the sample rate is greyed out.
Also, when I check the history box for the newly exported files it tells me "convert sample type on save as"
What is Audition doing at this stage?
How can it be converting the sample rate, when the sample rate is the exact same as the source? And the quality tab for sample rate conversion is greyed out?
All I'm doing is upping the clip gain slightly and then applying dither to these files. No sample rates are changed.
Any help greatly appreciated.

brazil101 wrote:
I'm using Audition to do some final mastering to 16-bit stereo 44100 wav files, in 32 float multi-track sessions.
I'm not changing the sample rate, channels or bit depth,
Except that you are...
If you open a 16-bit file as a 32-bit float, then you've changed the bit depth. It's the right thing to do if you are doing amplitude changes, as it makes any change effectively lossless, but it will still have to be converted back to 16-bit if you elect to store it like that.

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