It is part of DJ toolbox project: http://dj-toolbox.9f.com/
It define form of one period of signal. It is possible to move points with mouse.
Nearest, linear, spline interpolations method are used. It is possible to make continius signal.
Sound can be played or saved to wav file. Window is resizable.
See wikipedia about waveform: http://en.wikipedia.org/wiki/Waveform
My second version of the Waveform Generator: http://www.mathworks.com/matlabcentral/fileexchange/35183-waveform-generator-gui-2
Amazingly good !
The mathematical model is strong. Although an fatal error prevents MATLAB 7 from loading the GUI figure "wavf_gen.fig" in GUIDE. So, please upload the files again.
Updated to include an App file for R2012b