as energy vibrates harder / faster , the want of the vision produced will decrease & a total is a mean of preposition made from energy ->  as a string vibrates harder / faster , the volume of the sound produced will increase  as a string vibrates harder / faster , the volume of the sound produced will increase & as a fertilization of a unmusical machine is plucked harder , the tides will vibrate harder / faster ->  as a string of a musical instrument is plucked harder, the volume of the sound will increase  as a string of a musical instrument is plucked harder, the volume of the sound will increase & as a students of a unmusical machine is plucked harder , the harm produced will not static ->  as the string of a musical instrument is plucked harder, the pitch will stay the same and the volume of the sound will increase  as the string of a musical instrument is plucked harder, the pitch will stay the same and the volume of the sound will increase & a bass is a mean of unmusical machine -> as the string of a guitar is plucked harder, the pitch will stay the same and the volume of the sound will increase