One of the coolest features on the Yamaha Motif Classic and ES models is the ability to change the tempo of part of a song using the onboard sequencer. To do this, go to Song Mode, press the RECORD button, then for the track type select TEMPO TRACK. Now hit the PLAY button to start playback, although you are actually recording at this point. You can make tempo changes at any point in the song in real time! When you then SAVE the song, you're also saving the tempo changes. This adds a real human feel to the music you can produce using a Motif. The same thing can be done in Pattern Mode, but make sure that when you do this, you are in Pattern > Chain mode.