The tempo of a song determines how fast or slow the song plays. The tempo is defined in terms of beats per minute (bpm).
The Player mode allows changing the tempo while the song is playing (method 1)or setting it when no song is playing (method2).
Method 1 -
Adjusting the tempo while playing the song
or
Start playing the song with either of the play buttons.
Use the left and right tempo buttons to adjust the tempo. The result is displayed next to the buttons. The song will pick up speed or slow down depending on what you do.
Method 2 -
manually set the desired tempo
Use the edit control to enter a value between 30 and 480, then click on the set button.
In real life tempos vary in the 40 - 208 range. The high values possible in FastChords are just for fun.