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Many have noticed the positive effect of music on problems of mobility an= d that syncopating one's stride to the downbeat is enabling. It is not the= music or the rhythym per se that is enabling but rather the illusion that= setting one's foot down creates a sound (auditory feedback). When walkin= g to music the pd'er has to synchronize his stride to the rhythym to preser= v e the illusion. The regular ryhthym of the music gives him a predictable target by which to time his motor activity. A better more reliable approach to auditory enablement is to have the movement of the leg trigge= r auditory feedback. (although this approach requires some engineering. In= this way there is no rhythym to abide by. Regards, = Tom