anadol zgemma are the same 'Hisi' cpu as octagon sf8008 "AUDIO_SET_MUTE" work for them but it stop e2 sound and alsa sound together
for Vu+ i tested for all Model from solo to vu+ duo4k se have the same probleme AUDIO_SET_MUTE not work when /dev/dvb/adapter0/audio0 are used by enigma2 but in octagon sf8008 it work even if /dev/dvb/adapter0/audio0 is used
in vu+ when i stop the current service "AUDIO_SET_MUTE" work and i can write to /dev/dvb/adapter0/audio0 But the problem is that it stops the e2 sound and alsa sound together