[sdiy] Vocal pitch correction

[John Mahoney]

At 07:58 AM 5/30/2008, Tom Arnold wrote:

>Can anyone recommend a vocal pitch correction box?  Specifically, I'm
>looking for one with issues, lag, etc.  All analog would be awesome if only
>because that would have to sound awful, urm, I mean awesome.  Maybe even
>suggestions on how to create an effect like this some other way.
>
>Specifically, I want to take vocals and then with some lag, intentionally
>adjust or misadjust them.
>
>Thanks.

Lag is simple with any box -- just insert a delay line. :-)

Analog pitch correction, you say? What a concept. Seems like it'd be 
something like this:

1) input signal --> pitch-to-voltage converter --> scale quantizer

2) Compute the pitch correction CV (PCCV) by subtracting the 
quantized pitch CV from the unquantized pitch CV (or vice versa)

3) Use the PCCV to modulate a frequency shifter. (This will cause all 
kinds of distortion! And, it will virtually always be shifting by at 
least a small amount. It should really be a pitch shifter, but I 
don't know of an analog pitch shifter.)

Just a concept.

John


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