# BambooTracker Instrument File (.bti) Format Specification
v1.2.2 - 2019-11-09

---

The difference between v1.2.1 and v1.2.2 is only whether SSG noise pitch is reversed.  
This change affects the unit data of SSG tone/noise sequence.

Other data fields are remained from [v1.2.1](./inst_specs_v1.2.1.md).

---

## History
| Version | Date       | Detail                                                             |
| ------- | ---------- | ------------------------------------------------------------------ |
| 1.2.2   | 2019-11-09 | Reversed SSG noise pitch order.                                    |
| 1.2.1   | 2019-06-07 | Revised to fix unit data skipping bug of FM operator sequence.     |
| 1.2.0   | 2019-04-10 | Added and changed for SSG tone/hard or square-mask ratio settings. |
| 1.1.0   | 2019-03-24 | Added fields for FM3ch expanded mode.                              |
| 1.0.1   | 2018-12-10 | Added instrument sequence type.                                    |
| 1.0.0   | 2018-11-23 | Initial release.                                                   |
