Hi Neil, It appears this needs to process the audio in real time. If not some online text to voice sites may be of use. I recently got a bunch of phrases generated then processed in audacity. The varios audio files are then triggered as needed. I am curious if audacity can process in real time, then run thru a pi. Justin On 15 Jun 2018 04:08, "Neil" wrote: Anyone know of a good quality robot voice changer that will take a headphone-level signal, and spit out either a headphone level signal or an amplified signal? The ones I've found so far get poor reviews for sound quality and I feel like the basic on-board amps are a significant part of that, so unamplified is fine and I'll add a separate amp. This will be used for a robot project, and the voice needs to sound like a friendly robot that should appeal to kids. Though I would prefer a pre-built device (as I'm on a very tight schedule), I'm tagging this as EE in case anyone has a good circuit or kit) for this. Cheers, -Neil. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .