Sound troubles on 12.1

[Andrea Venturoli]

Hello.

On my PC I have two soundcards and they always worked perfectly up to 11.3.
Lately I upgraded to 12.1 and now one of them plays bad: sound is slowed 
and crackling as if the output could not work up to speed.

Relevant part of dmesg:
> FreeBSD 12.1-RELEASE-p2 #2 r357334M: Sun Feb  2 10:23:26 CET 2020
> ...
> hdac0: <ATI (0x970f) HDA Controller> mem 0xfe7e8000-0xfe7ebfff irq 19 at device 5.1 on pci1
> ...
> hdac1: <ATI SB600 HDA Controller> mem 0xfe5f4000-0xfe5f7fff irq 16 at device 20.2 on pci0
> ...
> emu10kx0: <Creative SBLive! Value [CT4850]> port 0xdc00-0xdc1f irq 20 at device 5.0 on pci4
> pcm0: <EMU10Kx DSP front PCM interface> on emu10kx0
> pcm0: <TriTech TR28023 AC97 Codec>
> pcm1: <EMU10Kx DSP rear PCM interface> on emu10kx0
> ...
> hdacc0: <ATI RS690/780 HDA CODEC> at cad 0 on hdac0
> hdaa0: <ATI RS690/780 Audio Function Group> at nid 1 on hdacc0
> pcm2: <ATI RS690/780 (HDMI)> at nid 3 on hdaa0
> hdacc1: <Realtek ALC892 HDA CODEC> at cad 0 on hdac1
> hdaa1: <Realtek ALC892 Audio Function Group> at nid 1 on hdacc1
> pcm3: <Realtek ALC892 (Rear Analog 7.1/2.0)> at nid 20,22,21,23 and 24,26 on hdaa1
> pcm4: <Realtek ALC892 (Front Analog)> at nid 27 and 25 on hdaa1
> pcm5: <Realtek ALC892 (Rear Digital)> at nid 30 on hdaa1
> pcm6: <Realtek ALC892 (Onboard Digital)> at nid 17 on hdaa1

Issuing "mplayer -ao oss:/dev/dsp0 Track_03.WAV" works perfectly, with 
output from the "front" SBLive jack.

Issuing "mplayer -ao oss:/dev/dsp1 Track_03.WAV" outputs sound from the 
motherboard, but, as I said, it's garbled!

Any hint?



Also, I think I was able to output from the "rear" SBLive jack, but 
there's no /devdsp2!

I do not really need that, but it might be an alternative if I cannot 
get the embedded card to work.


  bye & Thanks
	av.