[sdiy] Substitute for pin matrixes?

[Cary Roberts]

>You'd need a simple processor (a few dollars), some buttons, and a
>lot of LEDs, plus an analog matrix switch IC. Oh, and maybe some
>serial->parallel chips to drive the LEDs. The matrix switch and the
>buttons are the big costs.
>If you wanted to go the whole hog, you could use lighted buttons and
>build the matrix out of those. Cheaper is to use the X-Y scheme that
>Tim suggested.
>
>Either way, the ability to recall patches at the touch of a button
>has to be a massive benefit. Try that on a Synthi.

Of course, such a thing as described already exists:

	
http://www.hinton-instruments.co.uk/paprod/analogue/switchmix/index.htm

-Cary