I had not tried this feature yet, but I have now and can confirm Beaky's report that it does, indeed, work on the PSR-2100. In fact, not only does "Fill Self" work, but so, too, does "Fill Down", "Fill Up", and "Fill Break". Using "Fill Up", for example, pressing on the foot pedal plays the fill as it moves from variation A to B (or B to C or C to D or D to A). Continuing to hold the pedal down moves up to the next variation and continues to play the fill until the pedal is released. This certainly is a neat feature and, after I add a "lesson" on how to utilize these "fills", a lot more people will discover it and be happy they did. Well, not everybody. The Tyros owners will have to await the delivery of the next OS upgrade when this "feature" can be added to the Tyros keyboards.