You are able to configure the rear channels of a four channel 3D soundcard for cue channel output.
Click on the Ots Labs Power Amplifier in the OtsTurntables window. This will open the Output Configuration dialog box.
Make sure that your main soundcard is selected in the "ON-AIR" output device and that the Enabled option is selected.
Now select the Rear channels option in the Use on-air device for cue: options.
Close the Output configuration dialog box.
To test, play a file and click the Cue button on the Mixer. You should notice the cue channel output through the rear channels.
Note: 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 options. You can not allocate the same device in both places.
Tip: If you notice
cross-talk (cue channel in the main channel and vice versa) you may need
to optimize the Air and Cue cross-talk.
If you notice any warbles and/or pops you may need to calibrate your soundcard.
You may notice the ON-AIR signal through the cue channel. For instructions on how to remove the "ON-AIR" signal from the cue channel click here.
Cue channel output options
How to optimize Air & Cue cross talk
How to remove "ON-AIR" signal from the cue channel
Adjusting cue channel levels
How to set up your soundcard (main channel)
Output Configuration dialog box