lisp-gui-examples VS pstk

The Allegro egg is accompanied by a couple of examples but no examples showing the use of the audio addon. The Allegro library itself comes with an example showing how to generate a saw wave, but being a C library, the example is, of course, in C. I ported that example to Scheme. I would have contributed the example back to the Allegro egg, but the repo is marked as "archived by the owner" and read-only on GitHub. I've included the example in the repo alongside the rest of the code for this tutorial in case someone finds it useful.

You can check out the entire example on GitHub. This started as a personal learning project to explore the state of GUI programming in Lisp and has become a series of tutorials on building GUIs with various dialects of Lisp.

All PS/Tk function names begin with tk/ or tk- (or ttk/ and ttk- for the few Ttk-specific functions). The doc directory in the PS/Tk GitHub repo unfortunately has not been updated since this convention was adopted. One example from the docs is start-tk which is now tk-start.