[V4L] tda**** in AVerMedia TV Phone 98?

Well... just installed bttv-0.7.48 (BTW on WWW page there is still 0.7.46)
and I still can't get stereo sound.

I grep Windows drivers from CD, and found:

^@~C^@P^@^@s^@^@^H^A ^@^K^A ^@^O^D^@^@^P^?^@^@Found a TDA9874
^@Found an MPS3410
^@No Nicam chip found

so maybe I should use TDA9874?
I found tda9873 in tvaudio, but can't turn it on - even if I 
modprobe tvaudio tda9873=1
then 
modprobe bttv
dmesg still show me, that tda9840 is detected!

the most strange thing, is that mono/stereo switch works with code:

if (btv->audio_chip==TDA9840)
                {
                  if (v.mode & VIDEO_SOUND_STEREO) set_tda9840(btv,0x2a);
                  if (v.mode & VIDEO_SOUND_MONO) set_tda9840(btv,0x10);
                }

and:

void set_tda9840(struct bttv *btv,int value)
{
        bttv_I2CWrite(btv, I2C_TDA9840, TDA9840_SW, value, 1);  /* sound mode switching */
}

added to bttv-0.7.35

in bttv-0.7.48 I see messages like:
tda9840: chip_write: reg0=0x10
tda9840: chip_write: reg0=0x2a
but there is no effect in speakers...

should I just sit and cry?

-- 
I love the night  So many shadows 
Unholy light
Secrets of the heart  Leave 'em in the dark              "Lord of the Last Day" 
Forever                                                     - Ronnie James Dio