[mythtv-users] Installation was fine but no audio on Live TV.

[R]

I just installed MythTV on a Fedora Core 4 box.
Followed the instructions from Jarod Wilson.
The front end and back end are on the same box.
Got my channel lineup working.
I can watch live TV.

But I have no audio at all.
The sound card is C-Media PCI CMI8738.

The audio out of the TV tuner card is wired to the line-in of sound card.

As per Jarod's sound test, I did:
/usr/bin/aplay    /usr/share/sounds/KDE_Startup.wav
Playing WAVE '/usr/share/sounds/KDE_Startup.wav' : Signed 16 bit Little
Endian, Rate 22050 Hz, Mono

YES, I can clearly hear this test wav file from the speakers.

I just cannot get any audio on Live TV.
Please help.  I don't know what to do.

Here is the section "lspci -v":
04:00.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture
(rev 11)
        Subsystem: Hauppauge computer works Inc. WinTV Series
        Flags: bus master, medium devsel, latency 64, IRQ 11
        Memory at d7f01000 (32-bit, prefetchable) [size=4K]
        Capabilities: [44] Vital Product Data
        Capabilities: [4c] Power Management version 2

04:00.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev
11)
        Subsystem: Hauppauge computer works Inc. WinTV Series
        Flags: bus master, medium devsel, latency 64, IRQ 11
        Memory at d7f00000 (32-bit, prefetchable) [size=4K]
        Capabilities: [44] Vital Product Data
        Capabilities: [4c] Power Management version 2

04:01.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
        Subsystem: C-Media Electronics Inc CMI8738/C3DX PCI Audio Device
        Flags: bus master, medium devsel, latency 64, IRQ 10
        I/O ports at dc00 [size=256]
        Capabilities: [c0] Power Management version 2