There was a bug before, that caused the window to freeze up (seemingly forever). This was due to the fact that the times in milliseconds were being treated as time in seconds. This has been fixed with a *.0001 function.
Also, a block of code for the "delay" function has been added. Delays between same notes in the included demo song have also been added.
Based on pull request #1...
The list of frequencies to be played has been moved from the JS to a textbox in the HTML.
Editing the content of the box will change what gets played.
The format also is more human human readable and consistent with the songfile from #1.
If you copy and paste the smb.song file, it should work.