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Rewrote in simple language; added examples

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Ron Hale-Evans 2016-06-06 17:29:23 -07:00
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docs/reference/music/change-tempo.md
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# Change Tempo By
Change the tempo by the specified amount
Makes the [tempo](/reference/music/tempo) (speed of a piece of music)
faster or slower by the amount you say.
## Simulator
Simulation of this function is available in many, but not all browsers.
This function only works on the micro:bit and in some browsers.
```sig
music.changeTempoBy(20)
@ -12,7 +13,21 @@ music.changeTempoBy(20)
### Parameters
* `bpm` : [Number](/reference/types/number) - change the tempo by beats per minute
* 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).
### Examples
This program makes the music faster by 12 bpm.
```blocks
music.changeTempoBy(12)
```
This program makes the music _slower_ by 12 bpm.
```blocks
music.changeTempoBy(-12)
```
### See also