If I recall correctly, It's kinda' like playing with a live midi file. You create the chord progression and timing the first time around, hit the switch, and it continues with the same timing and progression while you play the entire length of the keyboard like a piano, etc...
I believe the reason the feature died with the G-1000 was no one used it--another neat idea that just didn't go very far.
Cheers,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)