I hope you answer me I need custom arrows and add more keys

I found a mod that uses Kade Engine, sorry. Not Modding+. (do you want modding+?) But you can set how many arrows you want. The maximum is 9 keys. There might be new updates that can add more key support, I don't know.

Here is the link: https://gamebanana.com/mods/311713

Use funkin vortex, pressing q and e will help u use custom notes