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Xen-Arts releases Xen-FMTS 2 - FM Synthesis Windows VSTi for Microtonal and Xenharmonic Music

Xen-Arts has released Xen-FMTS 2, a free 4-Operator FM Synthesis synth for Windows with a specialized set of features for computer musicians interested in exploring the expressive possibilities of making music with alternative intonation systems. It includes 115 patches, 55 microtunings and 56 partials files.


  • Internally loads and externally receives both MTS (MIDI Tuning Standard) Bulk Dump and Single Note Microtuning Files.
  • Operator ratios can easily be set to values that are coincident with the microtuning being used, thereby producing intonation related sidebands in the timbre of the instrument.
  • Microtonal pitch-bend ranges may be configured in cents, harmonics and superparticular ratios.
  • Arbitrary microtonal pitch shifting makes it possible to easily pitch transpose the oscillators in both octave and non-octave increments.

FM-RM Oscillator:

  • 4 Operator FM Synthesis with Ring-Modulation.
  • 57 Operator Algorithms.
  • 11 different Operator Waveforms.
  • Analog Pitch Drift Emulator.
  • Transposition by cents offsets.
  • Partials text files may be used to quantize the frequency ratios of the operators to user specified values.
  • Velocity-to-Harmonics Modulation enables oscillators to dynamically sound harmonics of the fundamental pitch.


  • Seven dedicated hybrid modulators for Operators A, B, C, D, Filters, Amplifier and Pitch.
  • Each modulator includes an ADSR style envelope generator, and an LFO which can be switched to run at audio-rate.
  • Each ADSR Envelope Generator features Per-Stage Keyboard Tracking.
  • LFOs can either be synchronized to the host DAW tempo or set in Hertz. They include 24 Waveforms, a Slewer and can be switched to run at audio-rate.

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.

Performance Control:

  • Full controller 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 PC.
  • 12 Note Polyphonic.
  • Monophonic Legato Mode.
  • Monophonic Portamento.
  • Microtonal Pitch Bend.
  • Vibrato.
  • Effects include Chorus, Lowpass Filter Cascade (Warm Filter) with 6 dB to 48 dB per-octave filters and Stereo Ensemble.

Price: Free.

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