what is it:
a MIDI-enabled software recreation of the hardware Klee step sequencer - developed with the input of the sequencer's creators!

New version 2.2 now available!
(see Version History in Documentation for details)

what are its features:
Includes virtually all major functions from the hardware Klee, and adds many new ones. New features in version 2 = new

• VST instrument hosting new
Intelligently constrain output notes to scale (using Modal Object Library) new
Output chord based on active root note - up to 6 notes in chord, plus root note new
External pattern load via MIDI or audio input triggers new
External MIDI controllers support via MIDI CC messages, with MIDI learn new
Group A - Group B output new
Convert active LEDs to active switches, for Groups A, B, or A and B new
Reverse sequence direction new

Built-in clock divide capability, now with additional options new
MIDI output to any hardware or software synths
Internal or MIDI clock control
10 preset slots for instant recall of parameters
Presets can be saved to and loaded from disk
Synchronous load - loading of pattern happens on clock pulses, and not in between
Load on Play feature to allow for loading of pattern each time clock started
MIDI-controllable baseline note
Custom definable note range allows for alternative scales

let me see it:
click thumbnail above for screenshot. Videos below! (click YouTube logo to view larger)

Controlling two Mutable Instruments synths with v2:

External MIDI control feature in v2:
Scale & Chord features in v2:
Pulse Width, Direction and External Load features in v2:
Demo of v1:

Also, check out these video examples of what a hardware Klee can do!

i want to learn more:
read the full documentation (pdf, 1.6 MB), or ask questions in our forum new
what do i need to use it:

Mac OS X 10.5 - 10.10, Intel only

Windows XP SP2, Vista, 7, 8
i want to try it:
have fun with the free Demo Version (differences from paid version: no presets, no scale or chord functions, only one VST, and will time out after 20 minutes)
i want to upgrade from version 1: you're in luck, it's free! You should have already gotten information about how to get it, but if not, just contact us
i want to buy it:
$40 USD
PayPal only, no returns -- please try the demo first to see if you like it.
Once we receive notification from PayPal of your payment, we will e-mail you secure download details within a maximum of 72 hours, and usually within less than 24 hours. You will not receive any software or documentation via postal mail, only an electronic download.
who made it:
Dan Nigrin & Defective Records Software
what made it:
created using Cycling '74 technology
i have a question:
please ask in our forum new
any other cool stuff:
go take a look
  © 2009-2015 Dan Nigrin & Defective Records Software, All Rights Reserved
who's using it and what they're saying:

Computer Music Magazine (UK)
July 2011 - Step by step tutorial on using the software Klee


Scott Stites
(creator of the Klee sequencer)
Scott Stites Birth of a Synth
"Dan Nigrin's software Klee has taken the Klee Sequencer to where no hardware version could ever go. He's both made it more accessible and expanded it in directions I never would have imagined."


Synthesizer Magazin
(Germany - Issue 28, Sept 2011)
Synthesizer Magazin
Read the M-185 and Klee reviews (in German)


Darwin Grosse
(Cycling '74
Darwin Grosse
"...I'm sitting in my living room with a Joker-like grin on my face, creating some crazy-ass sequences. You (and, by extension, Scott) have done some wonderful work here."

cEvin Key
(Skinny Puppy, Cyberaktif, Tear Garden, Doubting Thomas, etc...)
"Thanks! Very nice work. I have a real [hardware] Klee as well. And this one is much easier to operate!"


Olivier Gillet
(founder of Mutable Instruments, creator of the Shruthi-1 synth)
Mutable Instrument logo
"I thought the patterns produced by the Shruthi "warp" features were unpredictable... and then I tried this thing."


Bill Manganaro
(aka State Machine,; sMs Audio Electronics, member Klee hardware prototype team, supplier of hardware Klee parts kits & build services)
sMs Audio Electronics logo
"Expand, evolve, that's what electronic music creation is about for me. Now I have my hardware Klee control my analog gear, and my software Klee control my computer-based synthesizers... Now I can mold my sounds on the go! Brilliant piece of kit."