<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Thanks for all the replies to this question! It’s all very interesting. I used to have a Boss Octave pedal back in the 80s. I wonder if it also worked with BBDs. </div><div dir="ltr"><br><blockquote type="cite">On Oct 7, 2024, at 8:52 AM, Todd Sines via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8">My analogue time domain processing is limited to a Marshall Time Modulator and Klark Teknik DN-36. Neither offer full pitch shifting. For digital pitch shifting, once owned a Publison DHM 89, and still have an Eventide H949 + H969, Deltalab DL-5, Boss RPS-10, Lexicon 1200, and Varispeech II (cassette version of the Varispeech 27Y) which is more like a time stretcher, in that you can alter the speech but keep the pitch the same (in order to decipher fast-speaking conversations)<div><div><a href="https://obsoletetechnology.wordpress.com/repairs/lexicon-varispeech-27y/">https://obsoletetechnology.wordpress.com/repairs/lexicon-varispeech-27y/</a></div><div><br></div><div>Somehow this Schumann / clone seems like cheating and full of conversion artifacts — turning audio into a square wave with a PLL and creating overtones that sound like a cheap Halloween gag</div><div><a href="https://www.youtube.com/watch?v=iH9YG25OyZE">https://www.youtube.com/watch?v=iH9YG25OyZE</a></div><div><br></div><div>The A/DA Harmony Synthesizer pedal used Reticon SAD1024 BBDs to accomplish some pretty dark pitch shifting, at least 2 were used that I can see from this listing.. that BBD artifacting shimmer is amazing.</div><div><a href="https://reverb.com/item/4813895-a-da-harmony-synthesizer-1979-perfect-working-order-rare">https://reverb.com/item/4813895-a-da-harmony-synthesizer-1979-perfect-working-order-rare</a></div><div><a href="https://www.youtube.com/watch?v=l_0ZfIule5Y">https://www.youtube.com/watch?v=l_0ZfIule5Y</a></div><div><a href="https://www.youtube.com/watch?v=RXnMgCSSRqQ">https://www.youtube.com/watch?v=RXnMgCSSRqQ</a><br><div><br></div><div>You should also take a look at these auction items at Vemia / Sphere Music for some nice photos of Anton Springer’s time changer by Telefonbau and an Eltro Mark I (sadly limited by early era coding)</div><div><a href="https://spheremusic.com/Bargaindtl.asp?Item=28040">https://spheremusic.com/Bargaindtl.asp?Item=28040</a></div><div><a href="https://spheremusic.com/Bargaindtl.asp?Item=28039">https://spheremusic.com/Bargaindtl.asp?Item=28039</a></div><div><br></div><div><br><blockquote type="cite"><div>On Oct 7, 2024, at 4:03 AM, brianw <brianw@audiobanshee.com> wrote:</div><br class="Apple-interchange-newline"><div><div>On Oct 6, 2024, at 1:07 PM, Terry Bowman via Synth-diy <synth-diy@synth-diy.org> wrote:<br><blockquote type="cite">On Oct 6, 2024, at 3:51 PM, Florian Anwander <fanwander@mnet-online.de> wrote:<br><blockquote type="cite">There was the tape based solution, invented in the 1920s. (see https://valhalladsp.com/2010/05/04/pitch-shifters-pre-digital/) <br></blockquote><br>Don't skip past the linked Wendy Carlos post about the Eltro Mark II:<br><br>https://www.wendycarlos.com/other/Eltro-1967/<br></blockquote><br>Thanks for pointing this out, Terry.<br><br>"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.""<br><br>[...]<br><br>"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)."<br><br><br>________________________________________________________<br>This is the Synth-diy mailing list<br>Submit email to: Synth-diy@synth-diy.org<br>View archive at: https://synth-diy.org/pipermail/synth-diy/<br>Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy<br>Selling or trading? Use marketplace@synth-diy.org<br></div></div></blockquote></div><br></div></div><span>________________________________________________________</span><br><span>This is the Synth-diy mailing list</span><br><span>Submit email to: Synth-diy@synth-diy.org</span><br><span>View archive at: https://synth-diy.org/pipermail/synth-diy/</span><br><span>Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy</span><br><span>Selling or trading? Use marketplace@synth-diy.org</span><br></div></blockquote></body></html>