| A | ↛ | InstrumentString removed |
| ⇢ | A | VibratingString::getPhysicalLength() added | |
| A | ↛ | InstrumentString::__construct() removed | |
| A | ↛ | HarmonicCalculator::getPhysicalStringLength() removed | |
| A | ↛ | InstrumentString::getNumber() removed | |
| A | ↛ | InstrumentString::getPhysicalLength() removed |