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PCI TV audio - MythTV Official Wiki
https://www.mythtv.org/wiki/PCI_TV_audio#:~:text=MythTV%20Configuration%20For%20each%20capture%20card%2C%20you%20need,supports%20either%20OSS%20audio%20capture%20or%20ALSA%20capture.
Setup Capture Cards - MythTV Official Wiki
https://www.mythtv.org/wiki/Setup_Capture_Cards
Card type: V@Box TV Gateway networked tuner. These capture cards are digital TV tuners, able to receive digital TV signals from over the air (DVB-T/T2), satellite (DVB-S/S2) or cable (DVB-C). For more information see https://www.mythtv.org/wiki/VBox. These V@Box TV tuners need to be configured before adding to MythTV.
PCI TV audio - MythTV Official Wiki
https://www.mythtv.org/wiki/PCI_TV_audio
For each capture card, you need to specify a device for audio capture. Specify it in mythtv-setup->Capture cards->V4L->Audio Device. Mythtv supports either OSS audio capture or ALSA capture. ALSA is recommended. To use ALSA, set Audio Device to the new audio device. For example, if the card index specified is index=1, set it to ALSA:plughw:1,0.
Sound Troubleshooting - MythTV Official Wiki
https://www.mythtv.org/wiki/Sound_Troubleshooting
"Razzy" audio on a CX88 "Blackbird" card. When using at least one "Blackbird" card, the AVerMedia M150-D, MythTV sometimes records "razzy" audio with earlier kernels (see the card's Wiki entry for details) -- voices sound as if the speakers had kazoos stuck in their throats. The solution in this case was to use an external tuning script:
Configuring Digital Sound - MythTV Official Wiki
https://www.mythtv.org/wiki/Configuring_Digital_Sound
So just configure this device as the audio device in MythTV. On Mythfrontend Utilities/Setup->Setup-General go to the Audio page and set your audio device as Audio output device = ALSA:cards.pcm.iec958 Passthrough outputdevice = Alsa:iec958:{AES0 0x02} Enable AC3 to SPDIF passthrough check Enable DTS to SPDIF passthrough check Use internal volume …
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