error on MPD after change mixer

[nunnand]

I changed del mixer value to Analogue Playback Boost, tryng a solution for no audio output.
my config is raspberry pi4 and dac (based on iQaudio):
https://raspberrypiwiki.com/index.php/X400_V3.0

thanks

[rern]

If it's RuneAudio+R e6:
If already on new version: Settings > Addons - Update

rern

[nunnand]

my version is
• RuneAudio+R e6  20201221 

the update buttom is disabled

any other suggestion?
thank

[rern]