[This is preliminary documentation and subject to change.]
The AudioSubchannel property sets or retrieves the audio stream subchannel of a device.
object.AudioSubchannel [ = lSubChannel ]
 
  Windows NT: Unsupported.
  Windows: Requires Windows 98.
  Windows CE: Unsupported.
  Header: Declared in vidsvr.odl.
  Import Library: Included as a resource in vid.ocx.
  Unicode: Yes.
BPCDeviceBase.VideoSubchannel, BPCDeviceBase.DefaultAudioType