Glass Harmonica Ghost

How it's made

Source

three wet fingertips sustain separate glass bowls, using the pinned wine-glass model. Each includes filtered skin friction, pressure rotation and a slowly wandering rim-mode doublet.

Body

fundamentals span 420-930 Hz. Weak inharmonic bowl modes at 2.74, 4.95 and 7.35 times each fundamental bloom with pressure; the driven fundamental stays dominant, without strikes.

Envelope

independent 7-17 s raised-cosine swells fade each bowl nearly out between contacts. A second slow random pressure contour breaks periodicity; 1.8 s initial growth avoids a hard onset.

Pitches

minor-third/fifth, close semitone/fifth or open fourth/fifth voicings overlap without melody. Separate seeded source streams preserve the individual finger rotations and small tuning drifts.

Space

a diffuse temple return, darkened above 5.2 kHz, trails the direct swells by about 4 s. Reverberant distance is integral to this haunting scene texture; positions span left, centre, right.

Variation

register, contact spacing, interval tension, wetness and finger pressure distinguish a sparse apparition, low uneasy vigil, high glass veil and distant open-interval spirit choir.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.