[sdiy] Pitch shift in modulated BBD delays

[Michael E Caloroso]

Study US patent 4,205,579

I don't know if this was ever used in a Roland product.

MC

On Tue, Jun 16, 2026 at 9:27 AM Tom Wiltshire <tom at electricdruid.net> wrote:

> I've spent a long time wondering about how the LFO waveshape relates to
> the final pitch shift you get when modulating a BBD clock, as you would in
> a Chorus or Flanger circuit. Or even a delay-based analogue vibrato, come
> to that.
>
> I recently managed to get some interactive demonstrations done, which I
> think make the whole thing a lot easier to understand. Here's the finished
> article. Perhaps some of you will find it interesting.
>
> https://electricdruid.net/weird-wiggles-bbd-clock-modulation/
>
> Any thoughts, comments, or error-spotting appreciated.
>
> Thanks,
> Tom
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