[palosanto]

As a workaround while waiting for a fix, could you split it into two parts?

Geoff

Not really. The play buttons must be all on the same page ...

EDIT: Although the problem explained in the OP remains, I ended up embedding the clips in the pdf itself first and adding a button in the MSP entry that calls the file as exterior and it opens with Xodo pdf editor so that I'm able to play the clips.  MSP doesn't seem to support pdf's with embedded audio clips, at least I tried and they wouldn't play althought it would be nice if they did.