Audio Input Gain Too High - Line Input

Using GarageBand, I'm trying to record audio on the line level input. It records, but it's always too high. I can hear the distortion and see the clipping in GB. Using System Preferences Sound, I set the input level all the way to 0 and it makes no difference.
My sound source is the line-level output of an 8 channel PA.
Any ideas?

Got it fixed, defective user

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