Defining Audio Channels
Audio output is defined on a layer basis by setting the Audio Base Channel in the Inspector. The Audio Base Channel represents the first channel. If a media file or live input contains more than one audio channel the next channels are routed to the subsequent channels on the same output device.
The setting for the Audio Base Channel can be found in the Inspector after selecting the layer in the Timeline.
Please note, that the audio device is set up in the Settings menu accessible via the gear icon on the top right of the user interface.