Hi Robbie and Jody,  Recently I was researching different tracker
scales.  Specifically, I was looking at the G-roll tracker layout that
you have on the MMD web site.  It differs a bit from the information
I have.  My information is from Player Piano Co's 1978-81 catalog.
I don't know which is correct, but one of them must be wrong.  I just
thought I would let you know.

You can post this on MMD or just take note of it yourselves.

Benjamin Haass

 [ See http://mmd.foxtail.com/Tech/Scales/Groll01.html
 [ The reroll slot at this web page seems in error.  Otherwise the
 [ data from Hal Davis reflects the generalized use of the A-roll.
 [ Neither list is wrong; the 'G' roll can be used many ways.
 [
 [ The list below seems to be for a specific piano equipped with
 [ flute and violin pipes (perhaps as assembled by PPCo); it plays
 [ two keys lower than the list at the web site.  The range of the
 [ playing notes in an orchestrion or nickelodeon can be transposed
 [ a few keys sharp or flat to suit the available piano and extra
 [ instruments.  -- Robbie

 - - -

Here is what I have for the G-roll tracker layout.

Starting from left:

 1. Soft pedal (also changes percussion)
 2. Sustaining pedal (also loud)

   tracker holes 3-14 are octave coupled
 3. G# (piano key 12,24 : MIDI 32,44)
 4. G  (piano key 13,25 : MIDI 33,45)
 5. A# (piano key 14,26 : MIDI 34,46)
 6. B  (piano key 15,27 : MIDI 35,47)
 7. C  (piano key 16,28 : MIDI 36,48)
 8. C# (piano key 17,29 : MIDI 37,49)
 9. D  (piano key 18,30 : MIDI 38,50)
10. D# (piano key 19,31 : MIDI 39,51)
11. E  (piano key 20,32 : MIDI 40,52)
12. F  (piano key 21,33 : MIDI 41,53)
13. F# (piano key 22,34 : MIDI 42,54)
14. G  (piano key 23,35 : MIDI 43,55)

15. G# (piano key 36 : MIDI 56)
16. A  (piano key 37 : MIDI 57)
17. A# (piano key 38 : MIDI 58)
18. B  (piano key 39 : MIDI 59)
19. C  (piano key 40 : MIDI 60)
20. C# (piano key 41 : MIDI 61)
21. D  (piano key 42 : MIDI 62)
22. D# (piano key 43 : MIDI 63)
23. E  (piano key 44 : MIDI 64)
24. F  (piano key 45 : MIDI 65)
25. F# (piano key 46 : MIDI 66)
26. G  (piano key 47 : MIDI 67)

27. Flute Pipes or xylophone off
28. Reroll
29. flute pipes or xylophone on
30. Snare drum or snare roll or castanets
31. Piano (drum)  expression off (loud)
32. Piano (drum) expression on (soft)
33. Coin Trip
34. Tympani or single stroke Bass drum
35. Tympani or Bass drum and cymbal together
36. Tympani or heavy snare without snare roll
37. Violin pipes off
38. repeat play
39. Violin pipes on
40. G# (piano key 48 : MIDI 68)
41. A  (piano key 49 : MIDI 69)
42. A# (piano key 50 : MIDI 70)
43. B  (piano key 51 : MIDI 71)
44. C  (piano key 52 : MIDI 72)
45. C# (piano key 53 : MIDI 73)
46. D  (piano key 54 : MIDI 74)
47. D# (piano key 55 : MIDI 75)
48. E  (piano key 56 : MIDI 76)
49. F  (piano key 57 : MIDI 77)
50. F# (piano key 58 : MIDI 78)
51. G  (piano key 59 : MIDI 79)
52. G# (piano key 60 : MIDI 80)
53. A  (piano key 61 : MIDI 81)
54. A# (piano key 62 : MIDI 82)
55. B  (piano key 63 : MIDI 83)
56. C  (piano key 64 : MIDI 84)
57. C# (piano key 65 : MIDI 85)
58. D  (piano key 66 : MIDI 86)
59. D# (piano key 67 : MIDI 87)
60. E  (piano key 68 : MIDI 88)
61. F  (piano key 69 : MIDI 89)
62. F# (piano key 70 : MIDI 90)
63. G  (piano key 71 : MIDI 91)
64. mandolin rail down
65. Triangle or wood block