Seyler Jean-Yves wrote:
...
>
>         Does any of you has big ideas about a stand alone ".WAV files"
> player ?
>

Take a look at the ADPCM compression algorithm. The math is prety simple
and should fit into a PIC.

At ftp://ftp.pct.edu/pub/shared/mpx/DAC.pdf  i have found a paper about
compressing audio data, iirc there is also an AppNote from Microchip
about ADPCM.

> But, maybe, the audio quality would be rather nasty and I'd better switch to
> an "ISD design" with sounds recorded directly from the audio output of my PC
> ?
Good question !

Just my 2 cents ...

St.