[ Dave Vincent wrote in 150806 MMDigest:

> Wasn't there an "O" roll specification with extra instruments
> that was proposed years ago?

The text below is from PPCo catalog page 159.

"O" ROLL SCALE
 A. Play
 1. Timpani
 2. Bass drum (and cymbal)
 3. Timpani
 4. Indian block
 5. Snare drum, single
 6. Snare drum, roll
 7. Triangle
 8. Sustaining pedal
 9. Soft pedal off
10. Soft pedal on
11. Mandolin off
12. Mandolin on
13. Pipes or reeds on, swell shades open
14. Bells or xylophone on
15. Expression on (loud - bypasses regulating governor)
16. Expression off (soft - vacuum passes through governor)
17* Bells or xylophone off
18. Coin trip
19. Pipes or reeds off, swell shades closed
20. First playing note on roll; 20th on keyboard: 'E'
    Chromatic notes continue to 85th key: 'A',
    Notes 56 through 85 are in range of solo instrument
    (primary and secondary instruments)
86. Tambourine
87. Pump amplifier (extra tension on pump's spill valve)
88. Crash cymbal
 B. Rewind

Note: In tubing the No. 2610 spoolframe trackerbar, there are two extra
ports; One between 'A' & '1'; and another between '88' & 'B'.  These
are not mentioned in this scale because they were not used as planned.

Hope this helps.

Paul Rumpf
Melbourne, Australia