iOS/Android (Mac version below)
Tap on a song to reveal the playback controls.
 
Then tap the tempo indicator to set the tempo by one of these options:
1. Tapping + –,
2. Tapping the tempo on the metronome icon
3. Use the slider to set the tempo
 
Chromebooks can also use the keyboard keys, hyphen - and equals =
 
 
or with the Tempo window closed, use 'Fast mode' to change tempo quickly (this works with changing Repeats also) with a tap/drag up or down on the Tempo bpm
 
 
Mac
Either
- use the hyphen - or equals sign = on your Mac keyboard to incrementally change tempo
- or click up or down arrows next to tempo bpm
- or for Fast mode, drag with mouse up or down on the tempo (this works with changing Repeats also)
 
Showing click-drag of mouse up and down on Tempo bpm to change tempo
 
For Tap Tempo, tap the comma key on your Mac keyboard