[HowTo] RetroPie and OSMC: Retrosmc - Retrogaming on OSMC

having no sound in ES, but sound works fine in OSMC.
dtparam=audio=on already set in /boot/config.txt and hdmi_drive=2

excerpt from .emulationstation/es_log:

lvl0: VolumeControl::init() - Failed to find mixer elements!

no sound in ES… when I go in “Sound Settings” in the ES GUI I see “system volume” is at 0, but when I change to 100 and press start to close the changes, this will reset and the changes will not take effect.
Indeed if I re-select “sound settings” volume is again at 0!

03:38 PM osmc ~ $ amixer
Simple mixer control ‘Master’,0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 65536
Mono:
Front Left: Playback 1107 [2%] [on]
Front Right: Playback 1107 [2%] [on]
Simple mixer control ‘Capture’,0
Capabilities: cvolume cswitch cswitch-joined
Capture channels: Front Left - Front Right
Limits: Capture 0 - 65536
Front Left: Capture 65536 [100%] [on]
Front Right: Capture 65536 [100%] [on]
03:38 PM osmc ~ $

03:48 PM osmc ~ $ cat /proc/asound/card
card0/ cards
03:48 PM osmc ~ $ cat /proc/asound/cards
0 [ALSA ]: bcm2835 - bcm2835 ALSA
bcm2835 ALSA
03:51 PM osmc ~ $

03:57 PM osmc ~ $ cat /proc/asound/pcm
00-00: bcm2835 ALSA : bcm2835 ALSA : playback 8
00-01: bcm2835 ALSA : bcm2835 IEC958/HDMI : playback 1
03:57 PM osmc ~ $

alsamixer shows:
Card: PulseAudio F1: Help │
│ Chip: PulseAudio F2: System information │
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card │
│ Item: Master Esc: Exit

with sound set to 0.

Didn’t help when I set it to 100 though.