Peridos gives some information:

1PCI bios found, version 02.10, last bus # 01
2bus dev fun venid devid svnid sdvid   class
3 00  00   0  8086  7120  0000  0000  060000 bridge
4 00  01   0  8086  7121  8086  7121  030000 display
5 00  1e   0  8086  2428  0000  0000  060400 bridge
6 00  1f   0  8086  2420  0000  0000  060100 bridge
7 00  1f   1  8086  2421  0000  0000  010180 mass storage
8 00  1f   2  8086  2422  0000  0000  0c0300 serial bus
9 01  0a   0  13f6  0111  13f6  0111  040100 multimedia
10PCI bios found, version 02.10, last bus # 01
11codes:
12n\p: (not) prefetchable, r\R: ROM ((dis\EN)abled), i: IO space
13   start      end c bus device fun bar venid devid classcode
140000c000 ffffc0ff i  01     0a   0   0  13f6  0111    040100 multimedia
150000d000 ffffd01f i  00     1f   2   4  8086  2422    0c0300 serial bus
160000f000 fffff00f i  00     1f   1   4  8086  2421    010180 mass storage
17d8000000 dbffffff p  00     01   0   0  8086  7121    030000 display
18dc000000 dc07ffff n  00     01   0   1  8086  7121    030000 display
19list of PCI commands:
20probe (report all busses and devices)
21map (report PCI bus address use)
22rconf [bus device function size register] (read config register)
23wconf [bus device function size register data] (write config register)
24list of IO commands:
25peek [size address] (peek IO location)
26poke [size address data] (poke IO location)
27pokepeek [size address data] (poke IO location with readback)

I must use "pt PCI wconf" but i still need to figure out what comes after that.

I've added this to the previous post:

1list of IO commands:
2peek [size address] (peek IO location)
3poke [size address data] (poke IO location)
4pokepeek [size address data] (poke IO location with readback)

If i use the PCI command i must write the full register now i think i must use the IO command.
I've tried "pt IO peek 1 0xc01a" as a guy on another forum suggested and i get 0x00 . Does it make sense?
@Stretch I think you know peritool.

I've tried "pt IO peek 1 0x0388" and i get FF.
Then "pt IO poke 1 0xc01a 0x08" and i get 00 for the peek. According to that it should work and wolf3d detects adlib but i can't hear anything.
Lauching setaudio with /F388 i also get 00 for the peek and adlib is detected but it doesn't work. Also randomly adlib is detected without the parameter.
Another bug is that sometimes you get IRQ A for SB and you don't get SFX, Phil experienced that. The card uses the same IRQ for PCI and legacy audio BTW and i set it at 5.
So crappy broken drivers and crappy card. Those chips are old, later versions still have FM so it should have it but i get no music. May be some chips were defective i dunno.
It happens with two different cards, i don't think it's the motherboard. I get sfx even in real dos and no FM on windows either with the old driver and the OPL synth.

I suggest reserving IRQ 5 for ISA/Legacy in the BIOS. I also could never get SFX working in MS-DOS, but FM worked in the usual suspects like Doom, Duke3d, etc.

Wenas. So i guess the peritool thing was right. I tried reserving IRQ 5 at first but the card uses the same IRQ for pci and soundblaster. With IRQ 9 i got sfx in wolf3d but the machine hung after the first shot. No sound at all in doom. Using IRQ 5 for the card i got sfx to work in wolf3d but doom crashed when it tried to output sound (i heard the pop).
That when the card didn't try to use IRQ A of course xD.

I've just tried with an asus p3b-f and it's the same. No FM but only sfx in dos. Seems some chips were defective and somehow they disabled the FM module.
I confirmed that the software enables FM at least sometimes but i don't get any music.