No sound in garageband track

[kaio789]

Hello, I have been using garageband for a while, and this has never happened before, but several of my tracks stopped making a sound. The volume is up, the volume levels say that it is making a sound, but no sound is made. If I solo the track, still nothing happens. All the software instruments play fine, it is only the real instruments. I typically record all my real instruments on a separate digital four track, and then import them to garageband. there is only one of these tracks that plays fine, and if I move the other tracks to that track they play fine as well. If I make a new track and move them there, it also plays, but does anyone know of another way to fix this problem?