In Csound, the 'lpanal' utility is used to create an analysis file of the
pre-recorded speech to reproduce. The resulting file is used as an input to
the 'lp...' family of opcodes to synthesize the speech, using subractive
synthesis, often with buzz or gbuzz as a source. 

Read about these the 'lp...' opcodes and the 'lpanal' utility in the manual.
Also, Dodge/Jerse, "Computer Music" (2nd edition) talks about it.

-David.

P.J. Richardson wrote:
> I'm trying to use csound to process pre-recorded speech to emulate the