Hey man, would it be possible to export the 4 lane chart to a midi? I have a tool that converts midi files to a custom format used in a game I'm developing but transforming each song into midi then editing 19 lanes to get 4 lanes feels like the wrong way to do it.
I feel like you are doing everything I need sadly I worked too hard on making the scripts to use the unity timeline editor and can't turn back now.
I am willing to sponsor the change in your software from a game engine to a midi making tool, Just keep in mind I'm broke and trying to start in game dev so I don't have a lot of money but the little I have I'm willing to invest in this, of course you can release the tool as open source or whatever you want, not trying to make any proprietary stuff on my end.