My tinkering process has taken me into a different perspective in how this software could look. I came up with making a general main program which will have inner windows like a piano-roll, note editor among other things. You could pipe for example the piano roll into a sound file and then pipe it into the note editor to replay the notes after.
The piping could be done with nodes (like the ones used in blender) and dragging and dropping. There's also the VSTs which in the music creation world are like plugins that provide new instruments, for handling them i could just create a "companion" program that will accept the VSTs file and open a window with the VST's UI in the main program with the other inner windows. I'm thinking developing this with rust and Dear ImGUI.
Any feedback appreciated