I imported a QT file into Garage band which contained audio, into the movie track. I am importing a bunch of mp3 songs into other tracks. Earlier when I played the QT file via Garage band, I was able to hear the sound of the QT file, in addition of the mp3... but now, the QT file sound has disapeared!
I must say, that I had to delete the QT fiel out of GBand, and re-imported it. And yes there is sound on the QT file.
just like the tracks have the triangle to adjust the volume level, the "movie track" where the QT file resides, does not have any volume adjustment!
When you import a movie into GB, the movie's sound track is separated from the picture and appears as its own audio track. That's why the movie track has no volume slider. So if you have no sound track, you can't hear the movie's sound. No idea what could have happened to it.