[mythtv-users] Mythtv no voice, could you help to resolve this problem?

[=?GB2312?B?saa587vG?=]

I use the Federo Core 4, mythtv-0.19 and I conect capture card voice output
to the sound card line-in port
My capture card chip is philips SAA7134 series.
this mod about it.
saa7134               111765  0
video_buf              23749  1 saa7134
v4l2_common             5825  1 saa7134
v4l1_compat            13381  1 saa7134
ir_common               7493  1 saa7134
videodev                9537  1 saa7134
My sound card is intel8x0 on board chip.
mod related it.
snd_intel8x0           34689  0
snd_ac97_codec         75961  1 snd_intel8x0
snd_seq_dummy           3653  0
snd_seq_oss            37057  0
snd_seq_midi_event      9153  1 snd_seq_oss
snd_seq                62289  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device          8781  3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss            51185  0
snd_mixer_oss          17857  1 snd_pcm_oss
snd_pcm               100169  3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
snd_timer              33605  2 snd_seq,snd_pcm
snd                    57157  9
snd_intel8x0,snd_ac97_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore              10913  2 saa7134,snd
snd_page_alloc          9669  2 snd_intel8x0,snd_pcm

When I set the mix as the HOWTO said, there is no any voice in output of my
sound card. when I change the "mute" as "on", there will have voice, but it
only can be change volumn by use F10 and F11. when I pause and backward TV.
the voice will still play forward not sync with the video.

What should I do the resolve this problem?

Thanks
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