Export Audio Mixdown

I get horrible result when I Export Audio Mixdown.

Do I have too slow computer? I have a mid-2011 64-bit i7 iMac with 16Gb RAM. OSX 10.9.5

No. But honestly, you should post a useful description of your problem.

It works now.
Don’t know why.
It used to sound like some type of extreme digital distortion.
And I think the sound was chopped away here and there.

Can’t remember exactly what it sounded like.