It sounds like you want software that will allow morphing from one sound to another. 
 
 Kevin 
 
 
 
 Recently from Marcelo Caetano: 
 
 Dear list,       Feedback and comments are more than welcome.   Regards,   Marcelo Caetano 
 
 
 
 
 
 
 
 
 On 2011, Dec 6, at 5:25 AM, Daniela Sammler wrote: Hello,
  I am looking for a good a way to manipulate voice onset time in real speech, for example to create a continuum from "bear" to "pear". 
  So far, I spliced in aspiration noise between fricative and voice onset using PRAAT, but the result is not really satisfying.
  Can anybody give advice?
  Thank you very much! Daniela
  --  Daniela SAMMLER, Ph.D. Max Planck Institute for  Human Cognitive and Brain Sciences Stephanstr. 1a 04103 Leipzig phone: +49 341 9940 2679 fax:   +49 341 9940 2260
  
 
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