Thanks for taking the time to reply Frank.
For the record, the function object is simply a mouse/ GUI breakpoint function editor. I'm hoping one day that such a beast will exist not only with "lines & breakpoint dots", but also perhaps a bit more like the pen tool in illustrator or photoshop, allowing for curvature to be defined between breakpoints....
I'll keep your "annotated converts diary" idea in mind. I'm still grappling with Csound primarily at this stage. But hopefully sometime over the Xmas new year break i'll have a chance to install & have an initial look over PD....