Hi Jim,
my first thought is that it is something to do with the Soundcard and the fact that it might be unable to start the second audio stream until the first one has finished.
In the days of Echo Soundcards (darla, gina, mia) there used to be a setting called "Sync Wave Devices" - this needs to be unticked.
Regards
David Boulton Brand Manager Broadcast Radio Ltd
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