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Describe how we can subtract information to produce sound.

What is the question?An expressive feature of subtractive synthesis is...
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OK	Value	Feedback
	the filtering properties -- pitch, volume, and space -- can vary over time.	Pitch is a perceptual characteristics, not a physical property.
	the subtractive properties -- pitch, volume, and space -- can vary over time.	There is no such thing as 'subtractive properties'.
	the subtractive properties -- frequency, amplitude, and phase -- can vary over time.	There is no such thing as 'subtractive properties'.
	the filtering properties -- frequency, amplitude, and phase -- can vary over time.	Good job!

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