VOLUME_MUTE_BIT
sc->bIsMuted = (uint8_t)((nv.value & VOLUME_MUTE_BIT) != 0);
value = nv.value | VOLUME_MUTE_BIT;
value = nv.value & ~VOLUME_MUTE_BIT;
(uint8_t)((sc->gvol.value & VOLUME_MUTE_BIT) != 0);