I recently installed Zorin OS 18 Core and everything is working great except for the audio. I am using a headset for sound output, but the volume control is not behaving normally. I can only hear audio when the volume slider is set to the maximum level. If I lower it even a little bit, the sound either becomes extremely quiet or stops completely.
Hi and welcome to the forum.
Can you provide some information about your hardware specification, particularly the sound card/s.
If your PC is recent, then you may need to use a later linux kernel to support the newer hardware.
I assume you have been playing with Zorin>Settings>Sound to select output device and volume level.
You could also try using alsamixer to adjust sound settings:
Open a terminal session (CTRL+Alt+T), then type:
alsamixer
In alsamixer, hit F6 to list/select soundcard.
Then hit F5 to show All sound channels.
Look for channel [Loopback-mode] try changing that and test.
Also look at [Auto-Mute] channel settings and test changes there.
You could post a screenshot of your alsamixer, but make sure F5 is used first to show All sound channels, i.e. both inputs and outputs.