I don't really have an answer to your question but there are some externals like rfft~ that have a parameter to set the overlap. I would look at this external and others to see how they do it and if there is a common programming pattern.
Good luck and please tell us about your findings ;)

On Fri, Jan 16, 2015 at 6:30 AM, Alessio Degani <alessio.degani@ymail.com> wrote:
Sorry, there is a typo...

On 16/01/2015 12:23, Alessio Degani wrote:
[CUT] say, _Nc_ samples. Each chunk is a NON-overlapped adjacent chunk of the audiostream to be processed.

Here I mean _Nb_ samples! :)




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