If you dream of something being on low volume (such as a cell phone, or speaker), or that you turned down the volume on something, this means you need to pay closer attention to what people tell you.
This dream may also suggest that you are feeling left out of things.
To dream of loud volume, or that you turn up the volume on something, may predict arguments or disagreements with family members. However, this dream may also represent a breakthrough in your personal struggles. Perhaps you have burst through a barrier of resistance which had been holding you back for a long time.
For more clues, consider who was around you, or who you were talking to in the dream, when the volume got loud.