[sdiy] Walsh update

[mark verbos]

Scott Gravenhorst wrote:

>
>I might add here that a modulation signal can also be applied.
>I found that a PLL tracking a pitch can be nicely vibratoed by
>injecting an LFO signal mixed with the loop filter output feeding
>the VCO input.  Again, lots of parts, but a separate LFO for
>each pitch would give a fair amount of character.  Though as I
>said, it would be a whole mess of parts.  In the end, perhaps
>12 discrete oscillators with analog harmonic generation make the 
>most sense in terms of building.
>
yeah that would only take 3 euro cards per voice or 36 euro cards!