Sure, just because the chip is the same, doesn't mean the patches are the same. I bet the 'solo' chip has patches with more polyphony than those in the GM, since by definition you're only trying to play one instrument at a time instead of 16.

But then, if you were sequencing on the 'solo' side you'd possibly run out of voices with the higher polyphony instruments.

Do I recall correctly that the Ketron essentially gives you the patches, but they can't be edited?

Prado