Disklavier

I read in the recent Winter 2005 Accent magazine,
published by the Yamaha Piano Division, that the
artist, Kathleen Supove, uses Max/MSP to "program what
she calls 'toys' which allow the Disklavier to follow
[her] around on the keys or exponentially multiply the
number of keys "[she] plays..."

I went to their website and got the impression that
this interactive software is using audio files - not
MIDI files to do this.

Does this work on all Disklaviers?  Anyone have any
experience with this software?

Carol Beigel