Pinnacle PCTV Studio/Rave no sound out in Gutsy

I've a quite old Pinnacle PC-TV Studio/Rave. Previously working on Win various systems.
Also working fine on a Mandrake don't remember what (9?).

Now in Ubuntu 7.10 video is OK both with TVTime and Xawtv.

No way of making sound work. I attached speakers directly on the audio out of the card, no sound at all.

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andrea@andrea-desktop:~$ dmesg | grep bt
[ 58.193722] bttv: driver version 0.9.17 loaded
[ 58.193728] bttv: using 4 buffers with 2080k (520 pages) each for capture
[ 58.193794] bttv: Bt8xx card found (0).
[ 58.194039] bttv0: Bt848 (rev 18) at 0000:01:08.0, irq: 21, latency: 32, mmio: 0xdc000000
[ 58.194050] bttv0: using: Pinnacle PCTV Studio/Rave [card=39,insmod option]
[ 58.194053] bttv0: gpio config override: mask=0x0, mux=0x0,0x0,0x0,0x0
[ 58.194092] bttv0: gpio: en=00000000, out=00000000 in=00ff33ff [init]
[ 58.194127] bt848 #0 [sw]: Test OK
[ 58.322999] bttv0: i2c: checking for MSP34xx @ 0x80... not found
[ 58.330656] bttv0: miro: id=12 tuner=5 radio=no stereo=no
[ 58.330660] bttv0: using tuner=5
[ 58.330663] bttv0: i2c: checking for MSP34xx @ 0x80... not found
[ 58.331248] bttv0: i2c: checking for TDA9875 @ 0xb0... not found
[ 58.331812] bttv0: i2c: checking for TDA7432 @ 0x8a... not found
[ 58.332375] bttv0: i2c: checking for TDA9887 @ 0x86... not found
[ 58.376382] tuner 2-0060: chip found @ 0xc0 (bt848 #0 [sw])
[ 58.400869] bttv0: registered device video0
[ 58.400901] bttv0: registered device vbi0
[ 58.400928] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 59.880732] bt878: AUDIO driver version 0.0.0 loaded
[ 173.079412] bttv0: PLL: 28636363 => 35468950 ..........failed
(an so on...)
[ 196.031734] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 908.299466] bttv0: unloading
[ 926.964284] bttv: driver version 0.9.17 loaded
[ 926.964291] bttv: using 4 buffers with 2080k (520 pages) each for capture
[ 926.965205] bttv: Bt8xx card found (0).
[ 926.965221] bttv0: Bt848 (rev 18) at 0000:01:08.0, irq: 21, latency: 32, mmio: 0xdc000000
[ 926.965578] bttv0: using: Pinnacle PCTV Studio/Rave [card=39,insmod option]
[ 926.965582] bttv0: gpio config override: mask=0x0, mux=0x0,0x0,0x0,0x0
[ 926.965619] bttv0: gpio: en=00000000, out=00000000 in=00ff33ff [init]
[ 926.965654] bt848 #0 [sw]: Test OK
[ 926.980366] tuner 2-0060: chip found @ 0xc0 (bt848 #0 [sw])
[ 927.000352] bttv0: i2c: checking for MSP34xx @ 0x80... not found
[ 927.001010] bttv0: miro: id=12 tuner=5 radio=no stereo=no
[ 927.001013] bttv0: using tuner=5
[ 927.001827] bttv0: i2c: checking for MSP34xx @ 0x80... not found
[ 927.002459] bttv0: i2c: checking for TDA9875 @ 0xb0... not found
[ 927.003197] bttv0: i2c: checking for TDA7432 @ 0x8a... not found
[ 927.003922] bttv0: i2c: checking for TDA9887 @ 0x86... not found
[ 927.011838] bttv0: registered device video0
[ 927.012425] bttv0: registered device vbi0
[ 927.012601] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 927.175598] bt878: AUDIO driver version 0.0.0 loaded
[ 931.854888] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 932.013824] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 932.180535] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 932.337475] bttv0: PLL: 28636363 => 35468950 ......<6>Inbound IN=ppp0 OUT= MAC= SRC=82.91.202.99 DST=151.57.6.216 LEN=48 TOS=0x00 PREC=0x00 TTL=118 ID=18274 DF PROTO=TCP SPT=4720 DPT=1755 WINDOW=65535 RES=0x00 SYN URGP=0
(and so on...)
[ 966.440152] bttv0: PLL: 28636363 => 35468950 ..........failed
[ 966.596698] bttv0: PLL: 28636363 => 35468950 ..........failed

--------------------------

/etc/modporbe.d/bttv is:

alias char-major-89 i2c-dev
options i2c-algo-bit bit_test=1

# bttv
alias char-major-81 videodev
alias char-major-81-0 bttv

# PCTV RAVE
options bttv card=39 pll=1 tuner=5 debug=0 gbuffers=4
options msp3400 once=1 simple=1

--------------------------

etc/modules is:

fuse
lp
sbp2
bttv
i2c-dev
tvaudio
btaudio
bt878
snd-bt87x
saa7134

--------------------------
"btaudio" doesn't exist on Ubuntu 7.10
I think that "bt878: AUDIO driver version 0.0.0 loaded" means that no audio is loaded.

pls someone can help?
which module is missing?
is that a kernel bug?

best of all