That's not the only option. Most of the 16F and 18F series are more than capable of Real-Time voice capture and replay without any external voice chips. You just need some fast storage.

Microchip has an overview for 17 series here...

http://ww1.microchip.com/downloads/e...s/30602a17.pdf

Rather stupidly, one company has about TEN circuit diagrams of its commercial products posted on the internet, some using 16F77 and external Flash storage. You haven't got the code, but come-on, it's not going to take Einstein to figure it if the circuit diagram is presented to you on a plate.