If you are using TRAKTOR in combination with an external audio interface (or a controller with a built-in audio interface, e.g. TRAKTOR KONTROL S4) on an OS X Yosemite (10.10) system and the TRAKTOR window becomes inactive (the window is minimized, hidden behind another window or running on a another desktop with Mission Control), you may encounter the following issues:
- The LEDs on the audio interface / controller freeze.
- The audio drops out.
- The TRAKTOR application becomes unresponsive.
This is caused by the App Nap function in OS X Yosemite. App Nap helps save power by reducing the computer resources available for the application when the operating system detects a decrease in activity of the application. In TRAKTOR, App Nap becomes active if no audio is playing and the application window is not active. However, if the audio is playing in TRAKTOR via your audio interface but at the same time the built-in system audio of the OS X is fully muted, App Nap will be activated in TRAKTOR. In order to prevent this, follow the instructions for any of the methods described below:
Unmute Built-In Audio
In order to unmute the built-in audio, proceed with any of these two actions:
- Press the F12 key (volume up) on your Mac keyboard at least once. The volume display icon should show at least one bar.
- Click on the speaker icon on the top right of your computer screen and slide the volume fader up.
Switch the External Audio Interface to System Audio
Please read this article in order to learn how to switch your external audio interface to act as system audio. After you have performed the switch, the issue won't occur anymore.
Permanently Disable App Nap
You can permanently disable App Nap for TRAKTOR. In this case, the app will function correctly, regardless of the built-in volume setting.
- Open a Finder window.
- Go this folder: Macintosh HD > Applications > Native Instruments > Traktor 2
- Right-click on the Traktor app icon and select Get Info from the context menu.
- Under General, tick the option Prevent App Nap