Possible Clues:

• Increase in volume as amazing soccer secures goal
• In soccer, smashed goal - hear this from crowd?
• Ravel score with end beginning to climax: this heard?
• Part of mass includes short section to play with increasing volume
• Becoming louder in soccer den
• Staff request for increased output
• There's more of this to come, by the sound of it (9)
• Sound surge
• Increase of volume in music
• Growing louder (mus.)