PT8211 with oversampling and linear interpolation by Frank Bösing.
3 Stage CIC interpolation by Ben Rheinland

https://hackaday.io/project/5912-teensy-super-audio-board

perhaps add your wav-example too ?
todo: update gui

Change width to pulseWidth, update the example, keywords.txt and
gui/list.htm

Fixes the syntax highlighting in the Arduino IDE. This is my first time using Github's web editor, hopefully the whitespace comes out okay.