1) Amplifier knobs 2) Does multiplication on 3) High voices 4) High-pitched voices 5) Highest voice parts 6) Increases threefold 7) Multiplies by three 8) Shrill sounds 9) Shrill voices 10) Soprano parts 11) Sopranos 12) Stereo settings 
[The Tempest] the boys who sing the highest part in musical harmony.