Shruti-1 Specs

Thanks to the anon commenter who posted these specs for Shruti-1


  • 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.”


  1. Sorry it was me (who provided the info). I probably hit the wrong button underneath, or one of my kids asked me for a glass of milk etc?!


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