Kaona Sisyphus Granular Filter

Sisyphus Granular Filter, includes original tin box packaging.

Sisyphus is built around a granular engine and a palette of eight original filters. Its granular system allows multiple grains to coexist in a single stereo sound stream, combining them 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 true integration of filtering into the grain establishment process. Each generated grain 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 developed specifically and are not from standard libraries: they will therefore have a specific color that we'll 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. Filter at 12 dB/octave.

Bandpass: Allows a band of frequencies around the cutoff frequency to pass. Filter at 12 dB/octave.

Notch (band rejection): Widens around the cutoff frequency and lets the rest pass.

Peak (peak / bell filter): Boosts the band around the cutoff frequency, while allowing the rest of the spectrum to pass without drastically cutting it.

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

Karplus (Karplus-Strong): Simulates the vibration of a string or loop resonance, 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
Sets the filter cutoff frequency or center frequency, depending on the filter type, from 10 Hz to 20 kHz.

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

Feedback
Re-injects a portion of the output into the filters' input.

Variations
Introduces instability in the establishment of the cutoff frequency, resonance or feedback depending on the filters chosen and allows 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 the grains are organized relative to each other, and their density (their number and influence).

Grain Length
Adjusts the size of the audio grains. Shorter grains break up the sound into a grainy granular texture; longer grains produce a more like-new sound, but with more of a filtering and shifting effect. If multiple grains are played together, longer grains produce more echo effects.

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

Patterns
Grains are organized into predefined and configurable patterns. Several scenarios allow you 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 magnitude of the effects specific to each pattern.

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

Entrance and exit
Sisyphus works with two parallel channels that share common settings. It is therefore possible to use it either in stereo mode or as two different mono audio channels.

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

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

However, it is possible to configure the module differently using 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.