To dream that you are turning up the volume suggests that you are demanding to be heard. No one is paying attention to what you are saying. You are feeling overlooked or overshadowed in some waking situation.
To dream that you are turning down the volume indicates that there is something that you are refusing to hear. You may be rejecting what your inner voice or instinct is trying to convey.
To dream that the volume is too loud indicates that you are forcing your opinions and views on others. You are too overbearing and/or confrontational.
To dream that the volume is too low suggests that you are not paying enough attention to what someone is trying to tell you. You are not picking up on the cues. Alternatively, the dream signifies missed opportunities or feeling left out.