Maxim will sample multiplying DAC's in resolutions as high as 14-bit. To use
a DAC as a VCA send your signal to the DAC's Vref input. The Vref input will
be scaled with the binary word sent by the microcontroller and routed to
Vout. External amplification will be needed to drive speakers. National
Semiconductor will sample  audio amplifier chips with up to 68 watts power
handling capability that will probably work fine. The price is right.
Good Luck - Keith Causey

> Mathew,
>
> > Could you nice people suggest a good voltage controlled amp chip
> > (audio) for
>
> Some possibilities are:
>
> Analog Devices SSM-2018T (single channel VCA)
>
> That Corporation 2180 (single channel VCA)
>
> Crystal Semiconductor CS3310 (two channel digital volume control)
>
>
> The Crystal part can be interfaced directly to a PIC.  The two VCA's have
> analog control ports and will require some sort of D/A conversion to
> interface to a PIC.
>
>
> Kelly Kohls, N5TLE
> Dallas, TX
> Email:  kkohls@juno.com  OR  n5tle@qsl.net
> Homepage:  http://www.qsl.net/n5tle/
>
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