Iteration 22, setting the frequency of the tone.

Seems like a productive weekend here. I got another evening of coding in. Tonight I sorted out the rendering of nodes so they update with the change of wave form.

I also added the ability to change the frequency of the tone generated. that does lead to the question should I also display the frequency in the glyph. The name of the wave form is in some way redundant as the shape of the wave form tells you that information. It would be better to display the frequency as that is important information.

After that I am not sure what is on the list next. Part of me want to flesh out the Wave Form generator with more forms, like a pulse, triangle and so on but on the other hand that feels like I am heading deep into one type of node when I should be working towards allowing others. I also have not yet added a proper event system and without one of them having an undo command is going to be quite a bit of work, adding one in not trivial once the code base grows.