2012 macbook pro 13" sound drops out I am a dj playing live in a club.  after playing live music with traktor software for a couple of hours sound gets muddy and starts getting muffled then fades out/drop out.I am using a s4 mk2 traktor controller which has a sound card.  When i closed the program the let the system's quick player run it did the same time, but it was still running through usb controller.
The solution I found was to hook up my traktor 2 audio interface, which not only corrected the problem but gave me a bigger better sound.