George,
I couldn't have said this any better. To spice this up, even if you went ahead and recorded a SONG (SONG REC) on the X1/SD1 using the BACHATA pattern (which will Save as a GM file), you would be loosing close to 70% of it (esp when you use Arr C & D) when you attempt to playback this song on another keyboard. The Grooves track (9) will not be well interpreted unless if played back in another SD1/X1.
Just as other manufacturers have expanded on GM (TECHN=NX, ROLND=GS, YAM-XG, GEM=RASS etc), KETRON's 'Real Drums' are unique to KETRON ... they just have not named their standard yet.
With all these new formats, is GM 'dying'?
AJ