Jul 012014


The Microtonal Virtual Analog Synthesizer
by Xen-Arts
IVOR is a two-oscillator subtractive synthesizer that features full-controller MIDI Pitch Microtuning using MTS (MIDI Tuning Standard), where any MIDI Note Number can be freely microtuned to any desired pitch across the MIDI range, thereby enabling musicians and composers to explore the vast expressive possibilities of composing music with alternative intonation systems.
IVOR is a microtonal sound-designer’s virtual analog synthesizer with a carefully designed ergonomic workflow for quickly creating powerful sounding and musical useful timbres.
IVOR excels at making categories of timbres that include bass, distortion, keys, pads, broken, weird, leads and other analog synthesis types of sounds.
IVOR is an educational tool for learning about subtractive sound synthesis and musical instrument intonation (aka microtuning and xenharmonics).IVOR embodies a design philosophy of simplicity for microtonal music sound-design…
  • A ‘knob-less’ design featuring slider controls only, which enables intuitive direct control with a computer mouse.
  •  A dedicated control signal system mapped to the most important synthesis functions.
  • Settings are made by typing values into fields, dropdown lists, left-and-right arrows, switches and sliders.
  • Enables musicians to specify precise microtonal pitch-bend settings.
  • Features arbitrary microtonal oscillator transposition settings.
  • Velocity modulation of harmonics enables dynamically playing harmonics of the fundamental pitch.
Oscillator Section
  • Two Oscillators with 22 Waveforms
  • Microtonal, Harmonic Series and Subharmonic Series Oscillator Transposition
  • LFO (with Rate Sequencer) and Envelope Generator for Phase, Pulse-Width and Pitch Modulation
  • LFO and Envelope Generator features both Unidirectional and Bidirectional Modulation
  • Analog Pitch Drift Emulator with both Unidirectional and Bidirectional Modulation
  • Velocity-to-Harmonics Modulation enables oscillators to dynamically sound harmonics of the fundamental pitch
  • Ring Modulation with 23 RM Types
  • Oscillator and Ring Modulator Mixer
Filter Section
  • Pre-Filter Saturation Stage with 20 Saturation Types
  • Two Independent Filters with Six Filter Types: LP4, LP2, HPF, BPF, BRF, APF
  • One and Two Stage Filter Cascade
  • LFO (with Rate Sequencer) and Envelope Generator for Filter Cutoff Frequency Modulation
  • LFO and Envelope Generator enables both Unidirectional and Bidirectional Filter Modulation
VCA Section
  • Dedicated Envelope Generator
  • Switchable Velocity Sensitivity and Fixed Volume Control
Performance Control
  • MIDI Pitch Microtuning with MTS (MIDI Tuning Standard)
  • MTS Support for both Single Note and Bulk Dump
  • Loads MTS Microtuning Format Files Internally and Receives MTS Externally
  • Local (Per-Patch) and Global Microtuning (Static Microtuning for All Patches)
  • Microtunings can be loaded from any directory on hard drives or storage devices connected to the computer
  • Ten Note Polyphonic
  • Monophonic Legato Mode
  • Polyphonic Portamento with Three Glide Modes
  • Microtonal Pitch Bend
  • Vibrato
  • Effects include Warm Filter and Stereo Ensemble 

IVOR is a freeware 32-bit VSTi for Windows XP or higher and includes a detailed instruction manual, 98 factory patches and 54 microtonal tunings.



Please note that Xen-Arts software never has been, and never will be, infected with computer viruses; this we promise. If your virus software ever indicates that our microtonal music software has a virus, this is what is known as a False Positive. Contacting the developer of your virus software to make them aware of the false positive is the best solution.
 Posted by at 2:20 am

  4 Responses to “Ivor”

  1. My IVOR shows unreadable fonts in text boxes. I use windows 7.1. How can I correct the problem?

  2. Welcome Vahid,

    May I ask what language your computer operating system is configured for?

    There was a user some time ago who was using Cyrillic language on Windows, and they informed me that they were having problems with Xen-FMTS2, and I made a version for them that used all Arial fonts, which fixed the problem.

    Please let me know, either by posting here, or preferably through the contact form, so that we can communicate privately. It might be helpful to get a screen-shot of the UI when the fonts aren’t visible too, but I feel confident that we can get it fixed for you.

    Of potential interest, is that when designing these Xen-Arts VSTi, I used what I believed to be the most common system fonts to ensure that they would be installed on Windows’ PC by default, but there’s at least one – Terminal – which is used in some of the read-outs, that seemed to be a problem when the above mentioned user was using Cyrillic language in their OS. Switching those Terminal fonts to Arial fixed it.

    Best wishes for a happy new year,


  3. Any chance this will ever be ported to Mac OS X?

  4. Welcome Fred,

    It’s a frequently asked question, with a complicated answer.

    While there is reportedly some ongoing effort to make SynthEdit (the modular-synthesis environment within which all these instruments were built) cross-platform compatible for both PC and Mac, it is highly unlikely that it will ever manifest in the Xen-Arts instruments being available for Mac-based systems, due to that they all use proprietary and commercial 3rd party modules I either bought, or donated for, and all of the developers of these modules have now permanently left the scene. It’s also highly unlikely that the Xen-Arts instruments will ever be available in x64, although I’m using them all reliably with various kinds of bit-bridging applications.

    If, and when, a fully mature Mac version of SE does become available, it’s my hope, that at a minimum, the MTS functionality will be preserved, since this is one of the most powerful features of this program. Even without the proprietary modules used in the Xen-Arts line, being able to create any kind of MTS compatible virtual instruments for the Mac platform would be an epic breakthrough. Hopefully I won’t be a pensioner, or no longer alive, before this comes to fruition.

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