Apple Logic Pro /LogicExpress Discussion

Hey Guys,

     I had a Easter gig as a sound engineer at a church.  On my reference CD there were some 
tracks I created with Logic/iTunes, including a sine wave sweep.

     The track sounded okay at home but at the venue there was a TON of static/distortion on 
the tracks I created with Logic/iTunes.    The sine wave sweep made it sound like the higher 
the frequency, the more the noise.

     I can e-mail a file if anybody wants to hear.

    Just curious if anybody knew if this is operator error ... iTunes protective injection of noise 
to keep me from copying CDs ??

     I never had this happen with Logic 7.  I believe my output levels were okay.  The biggest 
puzzle is that I don't hear it in my studio monitors (KRK Rokit 8).

    Thanks,