Rings is a resonator, the essential ingredient at the heart of several physical modeling synthesis techniques. The resonator transforms an external, unpitched excitation audio signal into a full-bodied pitched sound. Rings is the bar, the tube or the bunch of strings you cause to vibrate with a bursty external signal.

Any signal can be fed into the resonator, including envelope clicks, trigger signals, noise bursts, even tonal sounds. It also contains a special "polyphonic mode", where four notes can ring together at the same time. Although it is not truly polyphonic, it adds density and chordal characters to the sounds output. For those wanting the functions of Elements without the losing HP real-estate, Rings is exactly the solution.

Three families of vibrating structures are simulated by the module, with CV control over their parameters:

Strings, membranes and tubes as modelled by Elements' resonator section (modal synthesis).

Strings coupled together and vibrating in sympathy, with controllable intervals between them.

Strings with a variable amount of inharmonicity.

Rings can be configured so that each new note is played on its own virtual string, while the previously played note(s) still decay. This unique take on polyphony allows the module to play strummed chords.

Controls

Number of strings / structures (1, 2 or 4).
Synthesis model (modal, sympathetic strings, string).
Main frequency (quantized in semitones).
Structure. With the modal and string models, controls the inharmonicity of the spectrum (which directly impacts the perceived "material"). With the sympathetic strings model, controls the intervals between strings.
Brightness. Specifies the brightness and richness of the spectrum.
Damping. Controls the damping rate of the sound, from 100ms to 10s.
Position. Specifies at which point the structure is excited.

Inputs and Outputs

Frequency, structure, brightness, damping and position modulation CV inputs with attenuverter (-8V to +8V).

"Strum" trigger input to indicate when a new polyphony voice needs to be allocated. Normalized to an edge detector detecting changes on the main V / Oct input, or sharp transients on the audio input. Detection threshold at 0.6V.

1 V / Oct frequency input (-1V to +5V).

Resonator audio input, normalized to a filtered pulse / noise burst triggered by the "Strum" input (for stand-alone use). Modular level, up to 16Vpp.

Two audio outputs, splitting the signal into even / odd partials in monophonic operation, or even / odd notes in polyphonic operation.

Specifications

Module width: 14HP
Module depth: 25mm
Current draw: 120mA @ +12V, 5mA @ -12V