Do you have any other applications open that might be using audio? If so, try closing them. You might be using software mixing, which means that sound can't be shared by more than one application. I get the same message when I try to use festival while a media player (e.g. Totem) is playing a sound/video file.
(I personally have no desire to switch back to h/w mixing, though. If I re-enable it, it causes an approx. 1 second delay between video/audio on everything.)
Last edited by MrCode; 11-24-2009 at 07:21 PM.
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