[SOLVED] OpenBSD in VM and sound

I have latest OpenBSD 6.6 installed in VirtualBox. with latest patches

doas syspatch -l 001_bpf 002_ber

All works except sound.
I tried AC97 and Intel HD Audio without success.
Both drivers are visible but no sound is produced when playing mp4 or wav.

I understand that OpenBSD is not supporting VirtualBox (no client) so obviously if there is no solution the the problem that is o.k.

I am hoping that maybe there is some sort of trick (sa the one I am using to run OpenBSD in VM in full screen) which will let me enable sound.

this is an output from mixerctl with VM with enabled Intel HD Audio (azalia)

inputs.dac-6:7_mute=off inputs.dac-6:7=254,254 inputs.dac-2:3_mute=off inputs.dac-2:3=254,254 inputs.dac-4:5_mute=off inputs.dac-4:5=254,254 inputs.dac-0:1_mute=off inputs.dac-0:1=254,254 record.dig-adc-0:1_sou=SPDIF-in outputs.hp_source=dac-6:7 outputs.hp_dir=output outputs.hp_boost=off outputs.spkr_source=dac-4:5 outputs.spkr_dir=output outputs.spkr2_source=dac-2:3 outputs.spkr2_dir=output outputs.mic_source=dac-6:7 outputs.mic_dir=input-vr80 outputs.mic_boost=off outputs.spkr3_source=dac-0:1 outputs.spkr3_mute=off outputs.spkr3=254,254 outputs.spkr3_dir=output outputs.SPDIF_source=dig-dac-0:1 outputs.SPDIF-in_eapd=on inputs.sel_source=line-in inputs.sel2_source=cd record.adc-0:1_source=sel record.adc-0:1_mute=off record.adc-0:1_sel=126,126 record.adc-2:3_source=sel2 record.adc-2:3_mute=off record.adc-2:3_sel2=126,126 outputs.hp_sense=unplugged outputs.spkr_sense=plugged outputs.spkr2_sense=plugged outputs.mic_sense=plugged outputs.line-in_sense=unplugged outputs.SPDIF-in_sense=unplugged outputs.master=255,255 outputs.master.mute=off outputs.master.slaves=dac-6:7,dac-0:1,spkr3 outputs.mode=analog record.mode=analog record.enable=sysctl

thank you,

installed and configured pulseaudio

now sound works

I opted to use sndiod instead of installing pulseaudio.

Compiled sndiod in Linux (host) and set it listening

sndiod -f rsnd/1 -L-

... that's for sound card 1 (running alsa), use rsnd/0 if you're using card 0 for sound.

Then in OpenBSD (guest booted using kvm/qemu), you can run for instance AUDIODEVICE=snd@192.168.1.5/0 firefox-esr to have the sndio forwarded to the Linux (hosts) IP (192.168.1.5 in this example).

Or just export AUDIODEVICE in OpenBSD
export AUDIODEVICE=snd@192.168.1.5/0