Sometimes the default volume step may be too large. Shift modifier is used to allow a finer control of something, so it's reasonable to support Shift modifier in the tray icon to allow the user to change the volume by 1% at each scroll.
Sometimes the default volume step may be too large. Shift modifier is used to allow a finer control of something, so it's reasonable to support Shift modifier in the tray icon to allow the user to change the volume by 1% at each scroll.