[CM] Making changes to snd's gui

[Guillaume Germain]

Hi all,

I'm currently working on developing a voice synthesis extension for snd.

I would like to be able to select a region in the transform graph 
(specifically on a sonogram). In fact the best for me would be to mirror 
marks and selection between the time domain graph and the transform 
graph. Also another alternative could be to replace the time domain 
graph by a sonogram with the same selection / marking capabilities as 
the time domain graph.

I'd be grateful if someone could point me at the places in the sources 
where I could make modifications and/or give me hints on how I can 
accomplish what I want to do.

Many thanks,

Guillaume