As an additional cross check, always use unmute all options in alsamixer, if something is not working.

Thanks for reminding me paying tribute to treebeard

The command:

$ amixer set Master unmute

did it.

This is old but may apply.

A strange experience here. My better half has been using the computer for several days now and have been using the Audio Mixer volume control plug-in with no issues.

A couple of days ago I opened the Audio Mixer panel by right-clicking the volume control plug-in and pressed mute for the master volume. But when un-muting it sound did not come back, and has not come back since. Neither master nor speakers are set to mute and volume controls are on full, but no sound with either aplay testing, VLC or Firefox on youtube.

I was afraid there was a hardware failure, but starting the Devuan Live installation image the sound is just fine. Until I right-clicked and opened Audio Mixer panel again and pressing mute on the master volume. When un-muting the sound did not come back. So no hardware failure and the same issue happened with the Live image running as with the permanent installation.

Does anyone have any idea as to what is happening here? This is the first time I have ever experienced this.

Thanks