Boss RC-20 - Practicing at a Different Tempo

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Using the RC-20 for practicing—Phrase Trainer
Practicing at a different tempo
To change the tempo while the phrase is playing, press the TAP TEMPO
button several times at the desired interval.
The tempo of the phrase will change temporarily.
* For details on changing the tempo, refer to “Setting the tempo” (p. 24).
* It is not possible to adjust the tempo beyond a certain limit.
If you wish to keep the modified tempo, save the phrase (p. 23).