AlphaTab does not support 'C played as' option for transposing instruments

[goodgame365]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When importing a Guitar Pro file with the "C played as" option set, AlphaTab only changes the notation display but does not adjust the key signature or note placement as expected. The actual pitches and rendering may be incorrect compared to Guitar Pro.

test file:

test.zip

Expected Behavior

I expect AlphaTab to fully support the "C played as" option, so that the key signature, note display, and playback all match what is shown in Guitar Pro for transposing instruments.

Steps To Reproduce

In Guitar Pro, navigate to Track > "Play C as" option and set it to a different key.

Link to jsFiddle, CodePen, Project

No response

Version and Environment

Version: AlphaTab 1.4.0 ,~1.7
Environment: Windows 10, Chrome 120

Platform

Web

Anything else?

No response

[Danielku15]

Thanks for reporting I'll look into this soon. Generally it seems we just need to relatively adjust the Key Signature, but I have to still check how GP behaves in combining own key signatures with the transpose. Especially if the key signature would then exceed the available range.