Voice Crystal Roland D50 - Voice RAM Card Set - Cards 1 through 6

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"This is a FULL Set of Voice cards.

They are in Excellent Condition

These are a must for anyone with a Roland D50 Keyboard or Rack Module."

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Roland Voice Crystal 4 64 Voice RAM for D-50 D-550

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Kawai K1 Voice Crystal Cards

Voice Crystal 1
"Rare and hard to find "Voice Crystal 1" 64 RAM card for the Kawai K1/K1m synthisizers. Holds 64 patches. Great way to expand your synth and store sounds you want to keep."

Voice Crystal 2
"Rare and hard to find "Voice Crystal 2" 64 RAM card for the Kawai K1/K1m synthisizers. Holds 64 patches. Great way to expand your synth and store sounds you want to keep."

Identical descriptions. Anyone know the difference between these two? As for Voice Crystal in general, if I remember correctly, they made patch sets in various formats for various synths, not just Kawai. I'm guessing these two were patch sets vs. blank memory cards considering the difference in their names. I remember seeing their ads in Keyboard Magazine.