Hi Elizabeth,
I didn't mean that you should use that method to alter the tempo, if you were actually playing live at a gig or at home - that would cause some problems.
Let's say that you have loaded a song/tune and you are playing/reviewing the song, but you feel that the tempo is a little slower or faster than you would like. Stop playing and make a note of the tempo shown on the KN7000 screen. Now tap the 'Tap Tempo' button at the tempo you would prefer, and you will see the new Tempo indicated on the screen. Try playing again and if you feel it's now OK then just save it back to your SD Card. If it's still not quite as you would like it, just repeat the process..... Next time you load the song from SD Card, it will of course be at the revised tempo
Alternatively, as suggested by other friends, you could use your second KN7000 to effect the tempo changes.