Pc To Macbook Pro, Audio Issues

So I have just moved from a windows laptop to a Macbook pro non retina. After migrating my music collection I noticed that a handful of files sound extremely odd while being ran through my Taktor S4. It sounds almost as if the songs where remastered in the worst possible way, Vocals will be extremely low and the backing track ridiculously loud. A few songs also sound like the vocal tracks are "pulsing" like an effect has been added.

Has anyone else experienced similar issues? is it maybe my files or is it the new mac?

I have only had the macbook for a week now and this is my first apple product so I have not done too much tweaking just yet but wanted to get some opinions on where I should start.

As of now the ONLY adjustment i have made is turning off wifi while in traktor.

Did you check the keylock audio quality settings in Traktor ?

Do the Tracks Still sound weird if the S4 is used as the Macbooks soundcard and you play them through iTunes ?

That sounds pretty odd. I went from PC to Mac with an S4 as well last year and had no issues.

It would be very helpful to know more about your setup.

What Macbook? How much RAM?
Which OS?
Which Traktor version?
Which S4? MK1 or 2?
Which driver are installed?

What are your Traktor´s audio settings? (try 48kHz and 256 Samples)
Did you recently update Traktor?