I have lost all audio output

I don't know what has happened, but I can't get any audio out from Soundtrack Pro anymore.
Even if I open previous projects, and try different audio outputs such as Built-in Out, Built in Line Out or my MOTU 828MK2, there's no audio, even though the meters show audio signal.
It worked a month ago, but even the projects I did one month ago are now silent.
In Final Cut Pro I have no problems getting the audio (thru my 828MK2) but when I switch to Soundtrack there's no sound.
I would have assumed they all use the same Audio/Midi setup?

go to settings, general, sounds, and check the volume. if the sound there is full blast, try going to settings, music, volume limit, and make sure that's turned off. now if that fails to work, try reseting the ipod by holding down the home button and the sleep/wake button at the same time until the apple logo appears on the screen. if that doesn't work restore your ipod on itunes.

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