For those who understand these things, the code for the Shruti-1 has been published by Olivier here.


One comment

  1. Quote;

    “Here are some specs:

    – mono audio output and input (input is sent to filter/VCA).
    – MIDI in/out.
    – 3 CV inputs (0-5V) on pin header.
    – TX/RX/RST pins for onboard programming with an usb->serial chip.

    – 12 LEDs (current page / modulation matrix visualization).
    – 2×16 LCD display.
    – 5 switches to navigate through 12 parameter pages.
    – 4 pots for patch editing (4 parameters per page).
    – 2 inc/dec switches.

    2 digital oscillators:
    – Available for Osc1&Osc2:
    * band limited wavetables: pulse, square (with pulse-width modulation), triangle with waveshapping, sawtooth.
    – Available only for Osc1:
    * sawtooth with sweepable resonance (casio cz-like).
    * simplistic FM.
    * lo-fi vowel synthesis (think “speak and spell”).
    * cheap 8bit waveforms with plenty of aliasing.
    * cheap square/PWM with even more aliasing.
    * colored noise.
    * 32 waveforms sweepable wavetable.
    * “sweep” oscillator which scans through all the waveforms.
    – Noise & sub-oscillator.

    Modulation and filtering:
    – CEM3379 filter.
    – 2 LFO (square, sawtooth, triangle, sample & hold), syncable to tempo & MIDI clock.
    – 2 ADSR envelopes.
    – 16-steps step sequencer.
    – 14 patchcords modulation matrix (16 modulation sources, 11 destinations). Modulation sources include MIDI controllers, pitch bend wheel and modulation, CV inputs, gater…

    – Arpeggiator with 15 different patterns + each of them with direction and octave setting.
    – Support for (some) indian/arabic scales.
    – “Patch performance” page in which 4 user-selectable parameters can be assigned to the 4 editing pots.

    – MIDI implementation with patch load/save by SysEx, patch editing by NRP.
    – Patch memory: 16 patches.”



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