Like say a kalimba? I’d like to be able to take either sheet music or simply play a keyboard on the screen as input and it could record what i input or produce the output from sheet music
Music Scanner is the only I’m aware of and it does basically everything (except the on screen keyboard part) but doesnt have more eclectic instruments for playback which I need more flexibillity with :(
Sounds like you might want a DAW (Digital Audio Workstation).
These are a little “heavy duty” for what you want and you will need one that support sheet music style notation but I think you should check out Reaper.
https://www.reaper.fm/
This video is pretty old but should be applicable still:
https://youtu.be/g2-T8inRPK0
For instruments checkout the BBC symphony orchestra plugin here:
https://www.spitfireaudio.com/en-us/collections/bbc-symphony-orchestra
Funny enough I use that BBC Orchestra VST for almost all my strings, including this track:
Concentrated Destruction by Thassodar on #SoundCloud https://on.soundcloud.com/frnrP5VTdloQvWsqUk
I’d also recommend Ableton, my DAW of choice, as it comes with several built-in MIDI instruments and powerful stock audio effect plug-ins.