Oli Larkin has introduced Endless Series v3 – a Shepard Tone synthesizer for Windows & Mac.

If you’re not familiar with Shepard Tones, they are basically an auditory illusion created by fading out one rising pitch while fading in another, starting at a lower pitch. The result is a sound that appears to be infinitely rising. The same effect can also be created with descending tones.

The above video offers an introduction to Shepard tones.

Details and demos below. 

Features:

• VST2/AudioUnit plugin based on the Shepard Tone auditory illusion
• Additive tone generator with up to 40 partials
• Circular pitch ring modulator, flanger, filter and 24 stage phaser FX
• Glissando, auto-stepped and MIDI stepped modes
• Many options to tweak harmonicity and timbre
• Stereo detune, phase offset and auto-panning
• Quantise pitches to 14 different scales
• Soft clipping, extra harmonics and noise modulation
• Fast ASR amplitude envelope in MIDI stepped mode
• MIDI reset-able for repeatable output
• Integrated help system
• 32 high quality factory presets

Endless Series is available now for £29.99 GBP.