All changes to tower
| Date | Change | Source |
|---|---|---|
| 5 Feb 2024 | Key amended to more accurately align with nominals. | |
| 23 Oct 2017 | 1-3: frameid added; frame info added | David Sloman via e-mail |
| 1 Mar 2007 | Tenor nominal added (E-49c: but others nearer scale of Eb) | Andrew Higson via pNBR |