36 lines
720 B
Markdown
36 lines
720 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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## Simulator
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This function only works on the micro:bit and in some browsers.
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```sig
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music.changeTempoBy(20)
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```
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### Parameters
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* a [number](/reference/types/number) that says how much to change the bpm (beats per minute, or number of beats in a minute of the music that the micro:bit 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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