GH2 Rode Video Mic Pro audio question

I have been shooting bands for a friends production company on my Gh2 with a rode video mic pro for audio. Once converted to Prores the audio file is 32 bit floating point instead of 16 bit integer like the rest of the audio files. After he synced all the video the audio from the 32 bit files begins to lag behind. I use Aunsoft MTS converter to get the files to prores. Is there a way to convert these files from mts to prores with 16 bit audio?
 
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