Possible Clues:

• Three-fold
• More than twice as high as the sound of it
• That's more than twice there's been no Bass!
• More than double the height, by the sound of it
• More than twice as high, by the sound of it.
• Raise again...and again
• Soprano - multiply by three
• Make or become three times as much
• Quake, losing heart, and find the voice high-pitched
• Word with clef or staff