Mac: clicks and noise when recording and during playback
On some newer Mac models (like some Mac Pro, some iMac models oder also the
MacBook Pro with Retina display) using Mac OS X 10.7 and higher, it is possible
that the usage of our USB audio hardware can produce clicks, drop outs and noise
when recording (and sometimes during playback) in multichannel applications
such as Logic, Cubase, Garageband, etc. - the reason is a change in the Apple
hardware that has influence on USB performance.
If you notice issues like that, change the buffer settings inside your application
first (if available). Some audio applications offer such settings in order to
improve the performance especially when working with larger projects that affect
the computer more.
If the setting is not available or if it does not change anything, then try
the following: launch Terminal from the Utilities folder. In the
command prompt that appears then, enter the following command:
sudo nvram boot-args="dart=0x0"
If prompted to enter your password, do so. After that reboot your computer
to see if the problem still appears.
If you ever need to restore the original settings, go to Terminal again
and enter the following command:
sudo nvram -d boot-args