COMPRO COMPRODTV User Manual page 7

TV Live Mixer
You can choose the audio source for watching live TV programs. The default is
set to main volume control.
Recording Mixer (Only available on Analog TV)
When using DVB-T PCI Tuner card, you need to use the internal audio patch
cable to connect to the "AUX-In" or "CD-In" port on your sound card and
choose "AUX-In" or "CD-In" in ComproDTV. (For the detail installation of your
DVB-T card, please refer to your product start up guide in the package.
If you are using VideoMate DVB-T USB Box, the audio will pass by "WAVE".
You don't need to choose audio source here.
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