> Sounds like it is time to look at using a PIC to store the sound.
> Check out Olins HAL project, which also has a separate program
> to put standard WAV files into a data format suitable for sticking
> in the FLASH

I have some old obsolete Texas CVSD chips that are good to
18kHz, for which I believe there is no replacement, and one of
these days I'll have a good look at this method for a PIC. The thing
I'm putting together for someone may or may not go anywhere so,
with all due respect to the customer, an ISD is a quick solution,
good enough for a prototype

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