You need to prepare the audio file with some other software and add the 'silence' to the file.
You can use Goldwave or Audacity.
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.. or by adding an empty file in the correct length at first position before the music file ...
Yes, I had thought about making a blank file with Audacity. I'll give it a shot. The trick will be how long - probably trial and error on that.
Thanks for the reply !
"Music file duration is less than 10 seconds"
Appears I can't just drop a spacer in that's less than 10 seconds.