Sound can be provided through any of the display computers, or through the production computer. Simply connect the sound output from the computer (usually a 3.5 mm mini-jack) to the amplifier or powered speakers. For more details, see “Sound Settings” later in this chapter.
If you need to run the computer’s line-level audio signal a long distance, you should use an audio line level transformer. This converts the unbalanced signal coming from the computer to a balanced signal, thereby reducing the risk of hum and noise when connected to a professional audio amplifier.
Using Multiple Sound Channels
You can have multiple display computers playing at the same time, which gives you multiple audio channels. The synchronization between computers is generally good enough for multi-language support or special effects sound tracks, but not for true, phase-accurate, multi-channel sound reproduction.
Another option is to connect a multi-channel sound interface to your production or display computer. This kind of professional interface can handle multiple phase-accurate sound channels. Furthermore, many desktop-style computers support multi-channel playback using several 3.5 mm output jacks.
Audio Device Setting
Audio device settings include audio device selection, sample rate and WASAPI shared/exclusive mode. In the production software, this is done in the “Audio Out” tab of the Preferences dialog box. In the display software, press Ctrl-W to reveal the menu bar, then choose the desired device, sample rate etc.
WATCHOUT supports WASAPI and ASIO drivers. Identify the type of driver by looking at the suffix of the device name, [WASAPI] or [ASIO].