Ian it is because the CS needs a double button press to start recording, and again to stop, and if you do not time the presses to be concurrent ( and it IS pretty fussy on the timing, believe me ), it does not start recording...

With the EC-5, record start is assigned to one pedal and playback to another. Which gives a much easier method of activating and playing by a simple one switch press.

Plus it means a user does not need to move their hand off the keybed to use it...which for certain songs, particularly those with busy chord progs is a godsend!

Dennis