Question about custom articulation

[Rip _Mus]

Hello,

I'm trying to define a new articulation, based on two stencils (above and below the staff), that I wrote.

I succeeded in making two distinct articulations. However, the attempt to create a single articulation, which chooses the stencil based on the direction specified in the post-event, failed.

Does anyone have any advice for me?

I attach the file I'm working on.

Thank you!

Rip_mus

new-articulation.ly
Description: Text Data