Sisyphus

Multi-filter, multi-grain granular filter

Sisyphus is built around a granular engine and a palette of eight original filters. Its granular system allows multiple grains to coexist within a single stereo audio stream, where they combine and interact with each other.
This filter is based on a comprehensive granular approach to sound: rather than a granular engine followed by a filter, it offers true integration of filtering into the grain-generation process. Each generated grain carries the filtering characteristics defined by the musician and will be combined with other grains according to evolving, configurable patterns.

These filters have been developed entirely from scratch in-house, without using typical filter libraries, so they each have their own unique color for you to explore!

Filters available:
Lowpass
Highpass
Bandpass
Notch
Peak 
Comb
Karplus (Karplus-Strong)
Ladder

Filter Controls

Cutoff (Cutoff Frequency)
Resonance
Feedback
Variations

Grain Controls
The incoming sound is continuously sampled and segmented into buffers. Each segment is analyzed, filtered, and then extracted to become a grain. You can change the length of each grain, the interval between grains, the way grains follow one another, how they are arranged in relation to each other, and their density (number and influence).

Grain Length
Adjusts the length of the audio grains. The shorter the grains, the more the sound fragments into a “grained” granular texture; the longer the grains, the closer the result is to the original sound, but filtered and delayed. When multiple grains are played simultaneously, longer grains make echo effects more noticeable.

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

Pattern
Grains are organized according to predefined, adjustable patterns. Several scenarios allow you to explore different ways grains can combine, from highly organized to more chaotic.

Density
Determines how many grains are played simultaneously and their intensity.

Variability
Sets the magnitude of the special effects specific to each pattern.

Transition
Defines the shape of the envelope applied to the grains as they link together.

Input and Output
Sisyphus works with two parallel channels that share the same settings. You can use it either in stereo mode or as two separate mono audio channels.

CV Inputs
Four CV inputs allow control of Sisyphus using other Eurorack modules. These inputs accept the standard Eurorack voltages (0 to 8 V).
The four basic parameters that can be controlled via CV are: Grain Length, Density, Cutoff, and Resonance.
However, you can configure the module differently using an external file on an SD card. In that case, any CV input can be assigned to any control, the input voltage range (from 1 to 8 V) can be set, LED brightness can be adjusted, and more.

https://www.kaona.fr/index.php/en/component/eshop/sisyphus?Itemid=0