With OtsAV's low latency audio pipeline you are able to configure a separate output channel for cue. This feature is great for professional DJ's who wish to listen and prepare the next song before it goes to air.
To find the "CUE" output
device click the 
icon on the toolbar.
This will open the Output Configuration
dialog box. The cue channel feature is in the Primary
audio output section.
There are three methods of obtaining cue channel output in OtsAV when using a WDM soundcard, see below for details. (for ASIO soundcards, see the bottom of this page)
With this method you use the right channel of your soundcard for the cue channel (same card you are using for your main "ON-AIR" output). The on-air signal is mixed to mono and then fed through the left channel of your standard soundcard. The cue channel is also converted to mono, but fed through the right channel.
Note: When using this method, Save as Wave and SHOUTcast functionality still receive a full stereo signal, so this method may suit your requirements.
See How to configure the right channel for cue.
Rear cue channel
With this method the rear channels of the main soundcard are used for cue. For this method to work correctly the main soundcard must be a 3D card; it must have at least 4 channels of output; must be set up to use all channels (set the speaker setup properties to "quadraphonic"); and must be capable of mixing 3D buffers in hardware. This is the preferred method for most people, and results in a full-stereo low-latency cue channel.
See How to configure a four channel soundcard for cue.
Second soundcard cue channel
To use this method, you must have a second stereo soundcard in your system. Although this method appears to be ideal, it is not. You may notice very occasional dropped or repeated frames when using this method. These glitches will only be heard through the cue channel output, not the main on-air output, so you may not mind. (The cause of these glitches is due to the timing crystals in both of your soundcards not being exactly the same).
See How to configure a second soundcard for cue.
Tip: If you have received the "Failed to allocate audio device. Close other audio programs and start again" error message, this could be because you are trying to enable the same soundcard in the both the "ON-AIR" and "CUE" output channels. You can not allocate the same device in both places.
Tip: If you are trying to connect headphones directly into your soundcard output channels you will find there is not enough level to drive your headphones. You will need to amplify this signal up to headphone level. You can purchase small amplification units for this purpose from an electronics store.
ASIO Soundcard Cueing
If using a multi-channel ASIO soundcard, select the stereo pair (e.g. [3/4])
to be used for cueing from the ASIO Cue drop-down box.
How to remove "ON-AIR" signal from the cue channel
How to optimize Air & Cue cross talk
How to set up your soundcard (main channel)
How to calibrate your soundcard