Like the error message says, sounds aren't allowed inside replicators. Looking at the MWorks source code, it's not immediately clear to me why they aren't allowed. Let me see if I can figure it out and change things so they are allowed.
In the meantime, I think you're stuck doing things the hard way and defining each sound individually. Sorry!
I wanted to follow up with a workaround, hoping it might help others in the meantime. The workaround is to convert sound clips to video clips. I converted WAV files to MP4 files using ffmpeg <https://ffmpeg.org/> (and added a still image throughout the duration of the sound clip) and this worked well with replicators (verified this on MWorks 0.9 and 0.10).