The following examples were discussed with respect to building simple graphical interfaces for your class pieces.

In addition to those discussed, I have included the patch to my recent guitar piece, "Roses Don't Need Perfume" including all sounds.  You should be able to simply open it and start advancing through events.

The only patch found below that is not mine is called "mondrian.pd" for which documentation can be found here:

https://puredata.info/Members/AlbertoZ/Mondrian