Something worth looking at...

[Michael Maloney]

How about a field programmable analog array?
http://www.fas.co.uk

I have somewhat mixed feelings about it in the big picture, as the devices
themselves sell for about $16.00 USD from Farnell in the UK, and Digikey
(the proclaimed US distributor) only has the development kits right now
(software, board, cable, 4 chips = $460.00)

Still, there's something very attractive about a linear "toolbox" on a chip.

Was also kinda intriguing that they chose as design examples a
four-quadrant multiplier, VCO, and voltage controlled gain cell. 

Just thought it might be of interest.

Mike Maloney