GP Exporter should write correct instrument articulation indexes

[Danielku15]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When creating an alphaTex percussion track, we use the built-in percussion articulations which we lookup via MIDI key. When exporting this to a Guitar Pro file, we write the midi keys 1:1 but this does not match the articulation list we write. Guitar Pro expects the articulation to be an index.

Expected Behavior

alphaTab should write proper GP files with the correct articulation list and references on notes.

Steps To Reproduce

Export this alphaTex to Guitar Pro and check it there.

\track Drums
\instrument percussion
\clef neutral 
\articulation Kick 36
Kick.4 Kick.8 Kick.8 Kick.4 Kick.4

Link to jsFiddle, CodePen, Project

No response

Version and Environment

Logger.ts:7 [AlphaTab][VersionInfo] alphaTab 1.5.0
[AlphaTab][VersionInfo] commit: 9000162eff4af40895bb41771fc792791e10b2e6
[AlphaTab][VersionInfo] build date: 2025-05-02T14:20:42.726Z
[AlphaTab][VersionInfo] High DPI: 0.8999999761581421
[AlphaTab][VersionInfo] Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
[AlphaTab][VersionInfo] Platform: BrowserModule
[AlphaTab][VersionInfo] WebPack: false
[AlphaTab][VersionInfo] Vite: false
[AlphaTab][VersionInfo] Window Size: 1930x1159
[AlphaTab][VersionInfo] Screen Size: 3840x1200

Platform

Web

Anything else?

Its likely best if we collect the used articulations when parsing alphaTex and then set the index instead of midi numbers.-