Finally I have solved the audio issue. I have used the proposed solution creating a file named asound.conf in /etc with the working config via SSH.
If I reboot, the problem remains because system always deleted the asound.conf, so I use chattr bash command for make it "undeletable" for anyone, even root.
So the solution has been:
chattr +i /etc/asound.conf
Thanks to everyone who helped me and thanks to RecalBox Team!
@zing thanks a lot! I found them in both cores, I have overrided default configs and I am very impressed with ps2 and gc performance.
@zing thanks a lot! I found them in both cores, I have overrided default configs and I am very impressed with ps2 and gc performance.
Hello!
I was wondering how to setup graphical options (and others too) in ps2 emulator. I have tried, but no success.
I don't find any keys (Fn keys or other combination) to access it as Dolphin.
Could anybody help me? Thanks!
@beto666 Yo tuve problemas similares... en algun caso incluso me impedia ejecutar comandos como root, no podía cambiar configuraciones de audio...
El problema era el programa con el que grababa la imagen de recalbox. Usaba Balena Echter hasta que cambie por el Raspberry Pi Imager... mano de santo oye! El problema era la estructura de particiones sobre la que se instalaba recalbox.
Desde entonces, cero problemas. Te recomiendo que hagas un instalacion limpia con el Raspberry Pi Imager.
Saludos!
Finally I have solved the audio issue. I have used the proposed solution creating a file named asound.conf in /etc with the working config via SSH.
If I reboot, the problem remains because system always deleted the asound.conf, so I use chattr bash command for make it "undeletable" for anyone, even root.
So the solution has been:
chattr +i /etc/asound.conf
Thanks to everyone who helped me and thanks to RecalBox Team!
@Zing Yes, of couse I've tried 
. As other users with related issues, in RB 7.x.x. I can only see 3 options (default, hdmi and Conexant(default)), but in RB 6.1.1 I had available at least 6 options (devices) for audio output and it worked for me.
I have search in all directories and I have found some interesting in files located /proc/asound/ (running process). I supose that it means that hardware is recognized and installed, but by some reason not usable or available for me.
/proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0x4000100000 irq 126
/proc/asound/devices
2: [ 0- 0]: digital audio playback
3: [ 0- 0]: digital audio capture
4: [ 0- 2]: digital audio capture
5: [ 0- 3]: digital audio playback
6: [ 0- 7]: digital audio playback
7: [ 0- 8]: digital audio playback
8: [ 0- 9]: digital audio playback
9: [ 0-10]: digital audio playback
10: [ 0- 0]: hardware dependent
11: [ 0- 2]: hardware dependent
12: [ 0] : control
33: : timer
/proc/asound/pcm
00-00: CX20632 Analog : CX20632 Analog : playback 1 : capture 1
00-02: CX20632 Alt Analog : CX20632 Alt Analog : capture 1
00-03: HDMI 0 : HDMI 0 : playback 1
00-07: HDMI 1 : HDMI 1 : playback 1
00-08: HDMI 2 : HDMI 2 : playback 1
00-09: HDMI 3 : HDMI 3 : playback 1
00-10: HDMI 4 : HDMI 4 : playback 1
Now I am going to make a new (4th) fresh install of RB 7.1.1... may be my last attempt before going back to 6.1.1 
@Dekiste, thanks for your response. Of course I have readed and followed every step you said, but since 7.x.x I have no sound throught HDMI output.
If I connect SSH and I create asound.conf in /etc, and reboot, the file is deleted by system.
In 7.0.1 I have not HDMI audio, but I connect audio jack and it worked properly. I have been playing 15 days with no problem.
When I updated to 7.1.1, everything seems to be ok: wifi, controllers, roms, bios... but if I reboot 4 times the PC, the sound goes off.
I have tried a clean install today (again) but the problem appears again: no audio after 4 reboots.
I use a i5-8th gen, integrated audio and graphics... any idea?
Thanks for your time and efforts!
Hello!
I always have had a lot of troubles with audio output since 7.x.x versions, but I "solved" it connecting the speakers to the audio jack connector instead of HDMI (Display Port) audio out... and I can hear my games, so nothing important 
A few days ago, I made a fresh install of RB 7.1.1... Everything worked fine (network, games, bios, audio...) but, suddenly, audio stopped working. After a few hours checking configs I surrended, no way to hear sound.
Ok, no problem, let's start again... I have made a (another) fresh install of RB 7.1.1 x86_64 and when I have rebooted 4 times in 5 minutes (for configuring system languaje, WIFI...) SOUND HAS STOPPED AGAIN!!!
It has no sense for me, I don't understand why reason everything works fine but in a few reboots it has stopped.
By the way, I have tried to solve audio output, but I can't create asound.conf at /etc (I have readed and followed all forum threads). If I reboot, asound.conf have dessapear!
Any help please will be welcome, I am getting mad!
@Ristul Hi there! Yes, I have the same issue with the audio output. It worked fine with 6.1.1 but I still have no sound through HDMI in 7.0.0 and 7.0.1. All the system sounds and game music is played by Internal PC Speaker or Jack 3,5mm.
Now, I can't choose any working option. I have only 3 choices: HDA HDMI, HDA Analog and Default option.
I will try with kodi and check if its related with driver or emulation station.
Buenas! Yo no consigo que el sonido salga por HDMI, me coge siempre el altavoz interno del PC. He reinstalado varias veces y sigue igual...
He probado a cambiar las 3 opciones que me da por defecto pero ninguna funciona. En la version 6.1.1 me aparecían muchas más, pero no doy con la tecla.
Alguna idea?