40 lines
744 B
Markdown
40 lines
744 B
Markdown
# Change Tempo By
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Makes the [tempo](/reference/music/tempo) (speed of a piece of music)
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faster or slower by the amount you say.
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```sig
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music.changeTempoBy(20)
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```
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## ~ hint
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**Simulator**: This function only works on the @boardname@ and in some browsers.
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## ~
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## Parameters
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* ``bpm`` is a [number](/types/number) that says how much to
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change the bpm (beats per minute, or number of beats in a minute of
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the music that the @boardname@ is playing).
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## Examples
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This program makes the music faster by 12 bpm.
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```blocks
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music.changeTempoBy(12)
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```
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This program makes the music _slower_ by 12 bpm.
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```blocks
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music.changeTempoBy(-12)
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```
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## See also
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[play tone](/reference/music/play-tone), [ring tone](/reference/music/ring-tone)
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