It needs smooth transitions added when it changes from one section to the other.
You can use the BBPlugin in Reaper and get smooth transition with smooth seek enabled. You can then use midi keyboard input to go to any section smoothly.
You can even send midi chords and it will go to that section.

Video: https://www.dropbox.com/s/vv9f52769gutq1l/BBPlugin-Conductor.mp4?dl=0