I believe the SX-P50 was a Technics Piano but I don't think that it is available anymore. I think it was replaced by the current P54 model which I have. It's the lowest priced Technic Piano unless you find one used. It's very compatible with the KN6500 except that the songs recorded on it will not play on the 6500 because it was one of the newest models before Technics quit making instruments. But it plays KN6500 and KN7000 disks.
It also cost more than the KN7K.
Heather
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Heather- Leesburg, FL PR54