Kaona Introduces Sisyphus Granular Eurorack Module w/ 8 Original Filters

via Kaona

Google translated:

Sisyphus is organized around a granular engine and a palette of eight original filters. Its granular system allows several grains to coexist in a single stereo sound stream that combine with each other.

This filter is based on a global granular design of the sound: it is not a granular engine followed by a filter but a real integration of filtering in the process of establishing the grain. Each grain generated carries the filtering characteristics defined by the musician and will be combined with the other grains according to evolving and configurable patterns.

The filters have been the subject of a completely specific development and are not from the usual libraries: they will therefore have a specific color that we let you explore!

Filters
→ Lowpass
Attenuates high frequencies beyond the cutoff frequency. Filter at 12 dB/octave.

→ Highpass
Attenuates low frequencies below the cutoff frequency. Filters at 12 dB/octave.

→ Bandpass
Let a band of frequencies around the cutoff frequency pass. Filters at 12 dB/octave.

→ Notch
Widens around the cutoff frequency and lets the rest pass.

→ Peak
Boosts the band around the cutoff frequency, while letting the rest of the spectrum pass without cutting it drastically.

→ Comb
Creates a series of cancellations and resonances, based on an internal delay and feedback.

→ Karplus (Karplus-Strong)
Simulates the vibration of a string or a loop resonance, by mixing a short delay, feedback and damping.

→ Ladder
Inspired by Moog analog filters, four cascaded stages. The filtering is steep (24 dB/oct) with a distinctive resonance that is potentially self-oscillating.

Filter Control
Cutoff (cutoff frequency)
Sets the filter cutoff frequency or center frequency, depending on the filter type, from 10 Hz to 20 kHz.

Resonance
Reinjects frequencies close to the cutoff frequency, from the slightest bump to the limit of self-oscillation.

Feedback
Reinjects a portion of the output into the filter input.

Variations
Introduces instability in establishing the cutoff frequency, resonance or feedback depending on the filters chosen and allows you to give a more or less “organic” color to the filter.

Grain Control
The sound is continuously sampled and segmented into buffers. An analysis is performed on these segments, a filter is applied, and a segment is taken to become a grain. It is possible to change the length of each grain, the interval between grains, the way grains are organized relative to each other, and their density (their number and influence).

Grain Length
Adjusts the size of audio grains. The shorter the grains, the more the sound fragments into a “grainy” granular texture; the longer they are, the closer the sound is to the original, but filtered and shifted. If several grains are played together, the longer the grains, the more the echo effects are noticeable.

Grain Interval
Determines the time between the start of two successive grains (or the probability of automatic triggering).

Pattern
Grains are organized among themselves according to predefined and configurable patterns. Several scenarios allow to explore the combination of grains, from the most organized to the most chaotic.

Density
Determines the number of grains played simultaneously and their intensity.

Variability
Determines the amplitude of the effects specific to each pattern.

Transition
Determines the shape of the envelope applied to the grains in their sequence.

Input and output
Sisyphus works with two parallel channels that share the same settings. It is therefore possible to use it either in stereo mode or as two different mono audio channels.

CV inputs
Four CV inputs allow you to control Sisyphus using other modules. The inputs accept the usual voltages in the Eurorack environment (from 0 to 8V).

The four basic parameters controllable by CV are: Grain length, Density, Cutoff, Resonance.

It is however possible to configure the module differently thanks to an external file installed on an SD card. It is then possible to assign a CV input to any control, to choose the amplitude of the input voltage (from 1 to 8 V), to choose the intensity of the LEDs, etc.