Thanks, epu, I knew that had to be it!

Note to KeyboardFreak regarding SRX-02:

All 48 waveforms on the board are stereo sampled sounds of a grand piano, with various microphone configurations and dynamic gradations. (p to ff)

The 50 patches are based on these waveforms, although some of them also include other XV patches (eg Grand w/Str). Almost all employ velocity switching using two to four piano waves.

About 15 of the patches are what I would call standard acoustic pianos. The rest are piano waveforms with different effects and/or other sounds added. 4 patches are categorized as EP's, 5 as pads, etc.