Jasper, a black Shepsky with tall ears and one blue and one brown eye, leads an armored army toward a dark horde. Angels and a choir fill the clouds above.

JASPER SHEPSKY SOUND LABS / INSTRUMENT 02

VESPER

Choir resynthesis

A voice held still.
A choir in motion.
A sound you can take somewhere else.

Explore the instrument ↓

INSIDE VESPER

Follow your curiosity.

Choose any knob or button. The panel makes room for its story: what it does, what it changes, and where it sits in the sound.

Interactive guide · static instrument image
Vesper's ivory and gold main panel, with Freeze, Alive, Explore, Halo Filter, and note controls

Click a control to look inside. Try the red ruby for the advanced section.

HOW VESPER TOOK SHAPE

It starts
with a choir.

What if a recorded voice could become the material for an oscillator?

The starting point was the character of a choir: the shape of its vowels, the movement of its singers, the air between its notes.

Vesper’s design extracts a changing spectral envelope from a vocal recording. That envelope describes how the sound’s energy is distributed across frequencies. The instrument uses those shapes to build new pitched tones when you play a note.

Three layers approach the same material differently. Freeze holds a selected spectral shape. Alive adds movement and the slight differences of an ensemble. Explore travels through the changing source. Blend them, tune them separately, then shape the result with filters and effects.

The source behind the research

The documented research atlas was derived from a short section of “Choral Chord with Breaths” by blackbar: a small female choir recorded for a college film. The analysis used a publicly available preview of that recording. It is a source of vocal spectral shapes, rather than a library of individually recorded singers. Final release content is still being curated.

FROM VOICE TO INSTRUMENT

A look through the signal path.

Choose a stage to see how the sound is built.

01

A little further into the engine

The reference architecture uses 64 time frames and 512 frequency bins to describe its source. Additive oscillator banks build notes from harmonics, with up to eight note voices. Alive uses three detuned banks; Freeze and Explore use one each.

Recorded spectral shape and played pitch are handled separately. Vocal Size moves the spectral envelope, while Transpose and Fine change pitch. Upper harmonics are attenuated near the sample-rate limit, and control smoothing helps changes remain continuous.

The native instrument extends this core with three envelopes, two LFOs, a morphing Halo filter, and chorus, delay, and reverb. Effects can be reordered. The architecture keeps sound processing separate from the graphical interface.

HEAR THE CURRENT INSTRUMENT

Give it a moment.

Two recordings from development builds. Listen to the sustained character of Freeze and the movement of Alive.

01 / ALIVE

A choir in motion.

02 / FREEZE

A voice held still.

These are recordings. The control guide explains the instrument; it does not change this audio. A limited playable web edition is planned.

Jasper as Vesper's knight

THE FACE BEHIND THE INSTRUMENT

Same Jasper.
A different world.

Here, Jasper leads the light into the darkness. Vesper’s choir, ivory panel, and red inner workings gave this scene its world. The dog at its center is ours.

Meet the real Jasper ↗