color change 8va/15va/22va mark

I want to make invisible 15va mark (due to flageolett).
Change color in properties has no effect.

Unfortunately not all items in the score respond to the colour property as yet, and octave lines are among them. This is on our list for things to add in the future.

Have you thought of changing the octave in the HALion player?

Hello Derrek,
I would like to have it correctly on the paper and also played. One way would be with hidden Octava-Mark.
How can I make it with HALion Sonic SE?

I used a trumpet for convenience, but when I adjust the HALion setting for the voice, pressing the middle-C “key” produces a sound two octaves higher.

Thanks for your help, Derrek. I’ll try to do so.