The scale used on the majority of 20 note organs today is.

1. F    6. E    11. C   16. G
2. A#   7. F    12. D   17. A
3. C    8. G    13. D#  18. A#
4. D    9. A    14. E   19. C
5. D#   10. A#  15. F   20. D

Numbers are from lowest to highest.
1-2 Bass
3-11 Accompaniment
12-20 Melody

If you need rolls for either of these scales, contact me. I am the US
agent for most of the sources.

I suggest you buy a "test roll" for the format you select. I have both
available.

Hope this helps.
Hal O'Rourke