| Digest Nr | Subject and Author |
|---|
 |
| 2018.05.09.05 | Tempo & Row Spacing on Reproducing Piano Rolls, from Dave Saul |
| 2006.02.01.02 | Key Spacing of Small Barrel Organs, from Bjorn Isebaert |
| 2004.10.15.05 | Wurlitzer & Philipps Tracker Bar Hole Spacing, from Art Reblitz |
| 2003.09.28.07 | Hole Spacing of Wurlitzer APP Tracker Bar, from Julie Porter |
| 2003.09.13.07 | Hole Spacing of Wurlitzer APP Tracker Bar, from Don Teach |
| 2003.09.12.08 | Hole Spacing of Wurlitzer APP Tracker Bar, from Bob Billings |
| 2002.06.13.01 | Two Row Tracker Bar Hole Spacing, from Jim Crank |
| 1999.10.14.06 | Information on Monkey Organ and Roll Spacing, from Andrew Barrett |
| 1998.09.11.12 | Duo-Art Accordion Spacing Adjustment, from Ian McDonald |
| 1996.08.13.12 | Channel Spacing, from Terry Smythe |
| 1996.05.28.07 | Proportional Spacing, from Jim Heyworth |
|
