You’ll be excited to know that Noteflight now offers the option to open your score in Soundtrap, the amazing online DAW! That gives you immediate access to a lot of the things requested here.
Just go to Export and choose “Open in Soundtrap” (requires a Soundtrap account).vroom supported this idea ·vroom commented
I would particularly like to see some basis synth sounds. At present, the only keys sound is the organ, which is fine but very limited.