Thanks, I went back and checked but I think I've found something a little more odd at play here...
I have a video file in the project without any audio (so it's just video, exported from Final Cut as just video). Reaper displays the 'i' and says it's resampled from 44.1kHz (even though there's no audio to resample), as the project is 48kHz.
Re-exporting the file from FCP with 'blank' audio at 48kHz removes the sample rate conversion and also the i386 process from the project. It seems very strange to me that sample rate conversion within a project would be operating at 32 bit rather than 64... anyone have any ideas?!
Very odd.
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