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Describe how amplitude changes over time.

What is the question?What is an envelope?
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OK	Value	Feedback
	An envelope is a special type of amplitude modifier that changes amplitude over time to give sounds a natural shape.	Good job!
	An envelopes ramps sound back down to a somewhat lower amplitude level	That is the decay phase.
	An envelope ramps up from zero amplitude to its highest amplitude.	That is the attack phase.
	An envelope is a special type of frequency modifier that changes frequency over time to give sounds a natural shape.	Envelopes are typically applied to amplitude.

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