Umm how do i add mine notes and death notes to my song??' i tried with alt + click but it didn't work plss help

you have to use funkinvortex and in vortex you use Q and E to switch notes

Well, I am actually struggling to add death notes with Funkin Vortex because the game will register it as normal notes.

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if you get the github version you can just press I or O to switch notes, but you have to build the game tho