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To playback audio with Pandoras Box, you have two options.
Firstly, you may play back wav audio files using ASIO. The PB Manager, Player and Server software support all common ASIO sound cards and offers audio and video playback synchronization to the audio clock via dedicated ASIO Tracks. The topic "Product Overview" gives an overview how many ASIO Tracks are available per product.
The ASIO Tracks will play mono and stereo PCM Wave files (16 or 24 bit) whilst the sample rate depends on the ASIO sound card.
More details regarding the setup and use of ASIO in Pandoras Box can be found in the chapters "Audio Tracks" and "Configuration tab > ASIO Audio".
Other media resources that you can assign to an ASIO Track, and hence will be perfectly synchronized, are audio channels from input cards. HDMI 2.0 input cards and 12G-SDI Input Cards offer embedded audio channels.
Secondly, you may use Video Layers to playback a video file with an embedded audio stream (such as mpeg2 or mp4 but also some mov or avi files depending on the codec used inside) or just audio without a video part (wav, mp3, wma). The audio device from which you will hear sound depends on your Windows settings where you can define the default audio device. Note that you can also "preview" sound with a Manager (or another master) if you enable to "Preview" the respective Client.
Important: Please be aware that audio files and videos with embedded audio playing on a Video Layer cannot be synchronized as with the ASIO option mentioned above, simply due to the used technology. For applications where video and audio files need to perfectly synchronized at any time of the show it is mandatory to use proper video formats and the ASIO option. However, Video Layers still provide a decent alternative for all other applications.
To convert audio formats or transcode video files with embedded audio, there are a numerous of converter tools available. It is also worth to check out the optional Encoder Extension for Pandoras Box.