Hi. I have created tool to create simple music.
I made it because other tools was too advanced for me.
All you have to do is download it, set your notes and click "export".
Application can make NTSC and PAL sound.
You can manually adjust duration of silence beetwen notes and
how long note will be playing.
There is usage example included.
Hope you will enjoy!
(And that this app will be soon available
or here: https://wiki.nesdev.com/w/index.php/Nesdev