[sdiy] Frequency shifted from BBD?

[brianw]

On Oct 6, 2024, at 1:07 PM, Terry Bowman via Synth-diy <synth-diy at synth-diy.org> wrote:
> On Oct 6, 2024, at 3:51 PM, Florian Anwander <fanwander at mnet-online.de> wrote:
>> There was the tape based solution, invented in the 1920s. (see https://valhalladsp.com/2010/05/04/pitch-shifters-pre-digital/) 
> 
> Don't skip past the linked Wendy Carlos post about the Eltro Mark II:
> 
> https://www.wendycarlos.com/other/Eltro-1967/

Thanks for pointing this out, Terry.

"Actually, his entire performance as HAL has a mild amount of time stretching (no alteration of pitch) going on, as Stanley confided to me. I told him I hadn't noticed it before, and he smiled: "it was about 10-20%, rather subtle.""

[...]

"And indeed, you couldn't do this simply by slowing down a regular tape recording, as many pundits have since wrongly guessed (to reach the final low pitch, the tempo would crawl to a near-stop)."