PLUGIN: Trumpet / Trombone Finger/Slide Plugin Simple and Under Notes

You can deduce easily if you have a transposing instrument or not.
You can deduce that from the notes them self, not from the instrument(*).

var note=curScore.selection.elements[0];
console.log(JSON.stringify({"pitch": note.pitch,"tpc1":note.tpc1,"tpc2":note.tpc2,"tpc":note.tpc, "basskey": note.tpc2-note.tpc1}));
if (note.tpc===note.tpc1) 
      console.log("In Concert Pitch")
else 
      console.log("In Played Pitch")
}

For a "Eb Trumpet", the computed bass-key is -3.

(*) This is not available as an instrument property in the API, though it is defined at the instrument level in the ìnstruments.xml` file.