[sdiy] Pitch shift in modulated BBD delays

[Richie Burnett]

Excellent article Tom.  Thanks for sharing it.

I love the interactive graphs!

Still getting my head around the details here, and it's interesting to read 
people's comments added at the end too.

The bit about a "fixed sample rate" chorus inherently behaving differently 
to a "variable sample rate" chorus is very true.  (My particular area of 
interest is in using the former to model the latter!)

-Richie,



-----Original Message----- 
From: Tom Wiltshire
Sent: Tuesday, June 16, 2026 2:20 PM
To: Tom Bugs via Synth-diy
Subject: [sdiy] Pitch shift in modulated BBD delays


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





________________________________________________________
This is the Synth-diy mailing list
Submit email to: Synth-diy at synth-diy.org
View archive at: https://synth-diy.org/pipermail/synth-diy/
Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org 


-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com