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fix: handle harmonic values in gp3-5 at best knowledge#2707

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Danielku15 merged 1 commit into
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feature/gp-harmonic-values
May 23, 2026
Merged

fix: handle harmonic values in gp3-5 at best knowledge#2707
Danielku15 merged 1 commit into
developfrom
feature/gp-harmonic-values

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Issues

Fixes #2689

Proposed changes

Adds reading and handling of GP3-5 harmonic values at best knowledge. The correct behavior is very guitar pro specific and it is not documented how delta-frets / harmonic pitch values should be applied exactly.

The GuitarPro UI allows various configurations which are likely not physically possible. GP8 import of various test files also showed that they fallback to some defaults based on inputs.

The new alphaTab knowledge is an assumption at best knowledge on what is likely meant. If users provide invalid behaviors we would need to selectively check the behavior of the given configuration across versions.

Checklist

  • I consent that this change becomes part of alphaTab under it's current or any future open source license
  • Changes are implemented
  • New tests were added

Further details

  • This is a breaking change
  • This change will require update of the documentation/website

@Danielku15 Danielku15 self-assigned this May 23, 2026
@Danielku15 Danielku15 force-pushed the feature/gp-harmonic-values branch from 44223fb to 75b9bd5 Compare May 23, 2026 16:15
@Danielku15 Danielku15 merged commit da088e0 into develop May 23, 2026
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@Danielku15 Danielku15 deleted the feature/gp-harmonic-values branch May 23, 2026 16:59
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Artificial Harmonic Values not mapped for older GP files

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