Mine works with a vague message that the volume was mounted. I have no idea how to modify or even if this is what you are looking for (xfce, Unstable).
I am now able to get notifications for USB keys and external HDDs. The thunar-volman-settings options were disabled.
Is there a way to get notification on new devices - ex when connecting a CP2102 USB-2-Serial?
I guess I am looking for a behavior similar to what one would get in windows where you have the beep beep plugging in and beep bop plugging out
Set SoundThemeName in Settings → Settings Editor → xsettings → Net
(xfce4-settings-editor)
to a sound theme located in /usr/share/sounds or ~/.local/share/sounds/
Turn up System Sounds in Pulseaudio Volume Control (pavucontrol)