[sdiy] 8bits, 10bits or12bits DAC for a midi2cv converter?

[Dave Manley]

John Mahoney wrote:

> For filter sweeps and other real-time adjustments, you could use a 
> technique like Moog's thing on the Little Phatty, I think it's called 
> True Analog Control (TAC). 

...

> TAC is patented, but I think you can use it for DIY. (Correct me, 
> please.) It doesn't seem that difficult to implement -- it's "just" some 
> electronic switches. Famous last word "just". ;-)
> -- 
> john
> 
> 

I think you mean RAC - Real Analog Control.

My understanding is RAC is a trademark and is proprietary, but I haven't 
seen any patent claims, nor did a quick search at the USPTO turn up 
anything.  Interestingly a trademark search didn't turn up RAC, but did 
return FREQBOX, ELECTRIC BLUE, MURF, etc.

-Dave