Volume does not change

[Ahegao01]

Hello Reader*s/Maker,

i've buyed the Vaydeer multimedia controller, which I wanted to use as global hotkeys for Spotify. Mute, stop/start, next/previous track does work, but no matter what I try, I'm not able to change the Volume with Toastify. I've tried a little AutoHotkey script before and now it at least changes the Volume when I'm inside of Spotify, but not outside of it. Any ideas? I would rlly appreciate the help.

Best Regards