Effect of Tone Envelope on Timbre

You will hear a recording of Bach chorale played on piano

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Now the same chorale will be played backwards

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Now the tape of the last recording is played backwards so that the chorale is heard forward again, but with an interesting difference

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Change in timbre with Traspositiion

A 3-octave scale on a bassoon is presented,

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A 3-octave scale of notes that are simple transpositions of the instrument's highest tone is played

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This is how the bassoon would sound if all tones had the same relative spectrum.