Mutable Instruments Anushri Analog Synthesizer (Sneak Preview)

This is a sneak preview of the Mutable Instruments Anushri synthesizer, now under development.

Features not demoed here:

  • Arpeggiator
  • VCA envelope and envelope modulation of VCO / PWM
  • The 8 LFO shapes and LFO > tempo synchronization

Here are the details on the Anushri synthesizer:

Analog synthesis

  • Analog VCO with saw and pulse waveforms, freely mixable.
  • Optional automatic VCO calibration in software for those who don’t like messing with trimmers.
  • -1 or -2 octaves sub-oscillator.
  • Auxiliary square oscillator (DCO) with accurate digital tuning available as an FM modulator or as a sync master for theVCO (yes, it means “ewwwwwwiowwww” and “wongwong”).
  • 12dB/octave multimode filter, with smooth self-oscillation.
  • Post-filter overdrive/fuzz circuit.
  • Linear VCA.

Modulation sources

  • 1 main ADSR envelope routable to pitch, pulse width, cutoff frequency.
  • 1 simple 1-parameter envelope (morphing through various stages, including the shape of the main ADSR, and a rigid “GATE” style envelope) routed to VCA.
  • Velocity routed to either cutoff frequency or VCA gain.
  • 1 LFO routable to pitch, pulse-width and cutoff frequency ; with 8 waveforms (triangle, square, ascending and descending ramps, S&H, bernouilli process, piecewise linear random process aka “autodubstep”, noise).
  • 1 triangle LFO for vibrato and/or growl.

Arpeggiator and sequencer

  • Arpeggiator with 4 modes (up, down, up&down, random) ; 1 to 2 octaves ; 6 patterns.
  • SH-101-style note sequencer with step by step recording, up to 128 notes. Easy recording of pauses, ties, and glides.
  • Tempo set by internal clock with shuffle, external MIDI clock or external 6/12/24 ppqn trigger.

Drum machine

  • Algorithmic drum pattern generator using an innovative “pattern sculpting” approach – allowing a large combination of drum patterns to be sculpted from 5 knobs
  • Digital sound generation of BD / SD / HH with tone control
  • Drum sounds can be freely triggered from an external sequencer using MIDI channel 10


  • 9 pots and 4 switches for hands-on access to synthesis parameters.
  • 9 “soft-pots” for editing modulations / arpeggiator / drum machine settings.
  • 3 dedicated navigation buttons (“modulations”, “arpeggiator / keyboard”, “drum machine”).
  • 3 dedicated sequencer buttons (“record”, “play”, “hold / rest”).


  • VCO CV in/out (Note: manual VCO calibration is required for accurate 1V/Oct I/O).
  • VCF CV in/out (Note: manual VCF calibration is required for accurate 1V/Oct I/O).
  • Gate signal in/out (5V level for output).
  • 24, 12 or 6 ppqn clock signal in/out (5V level for output).
  • External Audio in.
  • Audio out.
  • MIDI in/out (thru + arpeggiator and sequencer notes).
  • CC control over modulations and some of the digitally controlled synthesis parameters. Some parameters like filter resonance cannot be CC-controlled.


  • Remove main audio in / out and solder corresponding minijacks on PCB
  • Remove LT1054 and solder 2×5 power connector
  • Route MIDI in/out to front panel (if you want…). And that’s it!


  • DIY product (full kit)
  • Price < 200€ / kit
  • Available < October 2012

via Mutable Instruments

8 thoughts on “Mutable Instruments Anushri Analog Synthesizer (Sneak Preview)

  1. Very cool, Im a little wary of dipping my toes into the DIY pool just yet, but the Shruthi-1 and now this look VERY intruiging

    Has anyone else who is a novice at DIY tried to make a shruthi-1?

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    1. I built two sammichSID kits (one of which i borked somehow, still hoping on fixing it one of these days) with only little soldering experience and planning on getting a shruti-1 sometime. I would recommend building some simpler kit(s) first to get your soldering skills up to the required level, but i wouldn’t be intimidated by it. It’s a lot simpler than it seems. Patience, going over everything twice and watching some tutorials will get you a long way. After you get started there are a lot of options out there.

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  2. I built a shruti -1, got to the final stage of tuning the filter. The plastic Ikea chair and the carpet conspired against the completion of my Shruti and gave me and the synth a pop of static electricity. Synth display switched to Sanskrit, or what appeared to be. But something bad happened to the circuit and I still lament. I’m going back in when I get some time. But there is a phase distortion waveform (casio cz series used this techneque)In the Shruti that is all killer, no filler.

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  3. This thing looks awesome!! I want. It looks like these guys will be getting a big order from me very soon. Kudos to Mutable for making the kit Euro rackable, I know they had previously decided it wasn’t possible. Olivier is one of the most interesting and modern-minded synth designers that we have today. Two thumbs up.

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  4. This company makes one interesting product after another… Guess I’ll have to dig up the soldering iron in the future… Made a sammichSID myself some time ago, so luckily I’ll not be blocked by experience soldering.

    but that name… ANUShri!? … is it just me that has a dirty mind!? … well.. don’t answer :O)

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