hi,
 
i've reworked a little bit on sonograph~, added
resize capability and a silly transformation
which flips the frequencies.
 
the new release is available @ :
http://ydegoyon.free.fr
 
the changes are minor and the real object
of this mail is a request for finding
litterature about fft's morphing algorithms.
the goal is to implement these algorithms
to provide new transformations to sonograph~.
 
any hints welcome.
 
cheers,
 
yves/