Twin waves

Voltage-controlled Dual VCO/LFO
  • Two oscillators independently set as VCO or LFO
  • Features in VCO mode:
    • V/Oct tracking over 10 octaves
    • Through zero and linear FM
    • Sub-octave output
    • Hard & soft synchronization
    • VCA control and CV algorithms selection
    • Quantizer with various scales
    • 20 algorithm-based synthesis types among:
      • Wave shaping
      • Phase modulation
      • Phase positioning of multiple waves
      • Up to 5 stacked oscillators in tunable unison
      • Self-sync with phantom oscillator
      • Additive synthesis (7 waves)
      • Variable bit reduction (bit-crushing)
      • Ring modulator with its own 2nd oscillator
      • Noise with LPF, BPF, or resonant filter
  • Features in LFO mode:
    • Simultaneous signal and trigger outputs
    • External wave synchronization
    • Clock controlled rate with voltage controlled multiplier and divider
    • CV and knob control of output level
    • Algorithm based wave engine with a selection of:
      • Wave shaping
      • Phase modulation
      • Random levels and vectors (also Brownian)
      • Randomly spaced triggers and waves
  • Display with contextual icons and instant reminder help text
  • LEDs indicating potentiometer vs. value matching, switch settings and output levels
  • Automatically saved settings for instant recall at power on
  • Firmware update by playing an audio file via the front panel
  • Compact and skiff-friendly module

The driving idea behind the Twin waves voltage-controlled dual oscillator/LFO is to offer two interesting oscillators in a skiff-friendly and compact size. To achieve that challenge, we built the product’s architecture on the concept of pre-defined algorithms, where the most useful configurations and their matching parameter are ready to use.

The Twin waves was mentioned in the following query-posts on Muffwiggler:

  • Standout modules of the last couple of years?
  • What is the most FUN module you own?
  • What was your favorite module from 2017?
  • What are you using for LFOs?
  • Most unique digital VCO you've heard?
  • What's your favorite non-drum percussion module?
  • Must have VCO max 12HP
  • Superbooth 2017 Highlights


Dimensions mm inches Eurorack
Height 128.40 5.06 3HE
Width 40.00 1.57 8HP
Depth behind panel
(with supply cable inserted)
37.40 1.47


Supply rail Current draw
+12V 46mA
-12V 18mA
+5V 0mA

I'm so glad I got's an absolute gem.
Man this thing looks so nice, great features for a very reasonable price.
I use mine in LFO mode so often that I sometimes forget how amazing the VCOs are.
It's a monster (a dual monster).
The price/performance/features/HP ratio is just fantastic, IMHO.
I'm not sure what development in the module contributes to this aspect, but it produces some of the fullest/fattest sounds I've heard from a digital oscillator, not to mention it's packed with features and very well thought out.


Twin Waves overview by Marcin

Firmware update 1.13 - Algorithm selection by CV

Overall product presentation during Superbooth 2017
Eric from Klavis interviewd by Max from Prognosis

SH 8 by Vincent Vanesse
3 Twin Waves play all tunes.

Sicurezza by Andrea Ronen
A nice piece with the Twin Waves as the sole sound source.
Allow it a minute to start and wait for the bass line at 2:20 ;-)

Puzzle Girl by Modulogeek
Twin Waves playing the percussive arpeggio from 2:10

Twin Waves Demo by Perfect Circuit Audio
Twin Waves used as dual VCO

Twin Waves Offset by Dave Houtmeyers
Twin Waves does the arpeggiated lead line

15 steps brake and get physical by Gregory Delabelle

TW first patch by Dave Houtmeyers

Tuesday is Tuesday day by ApolaKipso
TW is playing the lead line, with nice tweaks

Firmware update 1.13 features presentation by Marcin

Audio clips

Set as dual VCO in OFFSET mode + SUB out, all mixed and sent to a Korgasmatron (filter modulated with a LFO sync of a second Twin waves using browian vectors algo.
  • VCO1: Unison SAW (note = C), Quantizer = minor
  • VCO2: Additive Odd (note = F), Quantizer = minor, harmonic content modulated from a second Twin waves in LFO mode with Brownian vectors algo
Overall FX: Black hole DSP + Z-DSP

  • First section VCO: Supersaw with phase spread driven by second section's LFO
  • Second section as LFO: Sine in Sync mode with mult/div ratio manually tweaked. Sent to VCO param + Korga for filtering.
Modcan Dual LFO introduced in the second part.

Changing algo on the fly manually.
( CV control of Algos was not available initially! )

  • Beats (Analog Rythm) and bassline (Twin waves + SSF Pole ZERO)
  • Sound effects (Twin waves + SSF MMF)

Twin Waves going through a WMD MMF VCF, is doing the bass line duties on both of these.
It is using the Unison Saw algorithm.

First minute is Twin Waves' output A in detuned saw algo.
Output B appears about a minute later in the self-sync sine algo.
Then the sub out comes in for the last minute to beef things up a bit.

Inspiration technology to let you create the difference
Klavis Modular Systems
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