Hi Heather,

I no longer have access to a 902, so I cannot comment on it. However, the 804 can play back data from the following models:

PR 602/3 702/3 902/3
KN 6000/6500/7000

The following performance data is compatible:

Composer and Sequencer data
Registration data (panel and panel memory)
Sound memory data
Pads (user bank data)

The KN models' Rhythm Custom, Favorites and user MIDI cannot be loaded into the 804.

There is no "backward" compatibility from the 804 to the above listed models, although the 7000 will load most files generated on the 804 if you replace the instrument ID number in the files.

While the 804 will play back data originated on the above listed instruments, if that data contain sounds and/or patterns not native to the 804,(and if they are not loaded specifically into the Composer and Sound memories respectively) a substitution will take place and the perfomance may sound quite different from that produced on the the original instrument.

Hope all this is some help to you, and I will follow, with great interest, your efforts to diminish, or even eliminate, data incompatibility problems among the different Technics models.

Regards,
George