It mostly allows the user to use their keyboard to call the FMPLAY command a lot. It's not very good as a proper instrument.

I made it using the BASLOAD utility, so a big thank you goes out to Stefan who I understand is the author of BASLOAD. Very exciting to learn that tool was available so I could forget about managing line numbers all the time

The source code can be found here:
https://github.com/aalexander05/x16-basic-synth
Try It Now!