Wendy's Thor Shepard Gliss v9 RNS + combinator
This is a cool Shepard-Risset "infinite pitch" acoustical illusion. It goes up or down. Similar to Shepard Tone, the parade of octave-spaced, rising or falling sine waves appear to never end, like the stairs in M.C. Esher's illusionary artwork. EditEd4TV did the Thor programming after I gave up on Subtractor! I also incorporated Peff's superb Hexpressor combinator devices to manage the amplitude envelope variations.
User Controls:
- Processor: 6 band "Hexpressor" (Peff) for smoother tones.
- Up/Down: Direction of tone parade.
- Mute: Handy after stopping (because the effect has a very long fade-out).
- Volume: Rotary 4.
The speed of the glissando is synced to song tempo. The effect is not perfect but it's close (there were limitations with Thor).
Performance Analysis:
Spectrograph
View Spectrograph which shows the sine waves aligned & rising in pitch (as well as Thor's inherent bad behavior).
Alternative Refill:
The above Shepard-Risset Glissando combinator was a collaborative attempt to generate the waveforms with Thor. Due to limitations with Thor, it is not perfect.
Previously, I had released a different Shepard Tone Refill (below) that uses a perfect computer-generated Shepard-Risset glissando that is set to loop in an NN-XT. That combinator is not as flexible, and some may hear the loop point, based on your computer's audio and bit rate.
WendysShepardRissetRefill.zip1.98 MB
