polyphonic granular synthesizer module for eurorack
zerua nahasi is a 4-voice polyphonic granular synthesizer for the eurorack modular format, with a wide range of granulation possibilities. It allows loading independent samples into each voice (slot), either by recording them or by loading them from a sd card, and controlling each slot's parameters individually or as a group, which provides a wide variety of sound manipulation possibilities. Live mode is also available: in this mode, the synth acts as a real-time granular delay.
The main granulation parameters are the grain volume, position, size, density, pitch/speed, envelope shape, and the polyvalent xxx knob. Each of these parameters can be cv-controlled and randomized individually per slot: with extreme parameter positions and heavy modulation, the granulation sound source becomes completely unrecognizable, and the sound exploration possibilities are huge. Furthermore, the synth features a convolution reverb engine, with a dry/wet control to affect each slot individually.
- 4 stereo voices (slots) - each slot can hold over 20 seconds of audio.
- smallest grain length is 5 ms - longest is multiple seconds.
- grain density can be as low as 1 grain per second, and as high as 20 simultaneous grains. per voice!
- different grain types use different processing algorithms, and the
pitch/speed andxxx knobs have a different behavior depending on the grain type in use on each voice. - the knobs can control the parameters of a single slot or many of them, depending on how many are selected. This gives a lot of control flexibility.
- pressing the
rand button while moving a knob, a per-grain stochastic offset can be applied to the corresponding parameter - grainvolume ,position ,length ,density ,pitch/speed ,shape andxxx can be randomized. - these knobs can be cv-controlled too - some of them even have a per-slot cv input.
- the
sync mode button allows the grain scheduling of the 4 voices to be synchronized in different ways. - when live mode is activated, the selected voices start performing real-time granulation on the input stereo audio signal - granulation can be done on the most recent audio (with minimum latency), or on over 30-seconds-old audio.
- the convolution reverb explained in the barcelona reverbera section is integrated in zerua nahasi too. There are 2 global controls,
size andcolor , and thedry/wet control defines how much reverb is applied to each slot.