Hi Mike (Mike Keitz), in <19970910.170134.5150.10.mkeitz@juno.com> on Sep 10 you
 wrote:

> If your application doesn't need to detect all 8 tones simultaneously
> then it can be optimized to use a lot less PIC resources by only looking
> for one tone at a time.  An example of this would be an answering machine
> which listens for it's owner to press 1-2-3-4 to replay any messages
> remotely.

Isn't it possible to hack such an answering machine by generating a
pseudo-DTMF tone with _all_ 8 frequencies at once, and repeat that tone 4
times with pause?