Kvraudio iconKvraudioSep 12, 2026 ~1 min source read

FRCTL Audio releases GRN v4.0.0 - New Engine, GUI Rework, Per-grain FX & More

FRCTL Audio has released GRN 4.0.0, a major new version of its granular effect plugin. GRN takes the audio on a track and plays it back as a cloud of overlapping grains, with the pitch quantized to a scale, so a loop, a vocal or a field recording turns into a texture that keeps moving.

FRCTL Audio releases GRN v4.0.0 - New Engine, GUI Rework, Per-grain FX & More

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FRCTL Audio has released GRN 4.0.0, a major new version of its granular effect plugin.

Every grain gets its own lowpass filter and drive stage, with coefficients locked at spawn, so resonance rings per grain rather than across the whole output.

GRN takes the audio on a track and plays it back as a cloud of overlapping grains, with the pitch quantized to a scale, so a loop, a vocal or a field recording turns into a texture that keeps moving.

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The useful part

FRCTL Audio has released GRN 4.0.0, a major new version of its granular effect plugin. GRN takes the audio on a track and plays it back as a cloud of overlapping grains, with the pitch quantized to a scale, so a loop, a vocal or a field recording turns into a texture that keeps moving. It installs next to GRN 3 rather than replacing it: existing projects keep opening GRN 3 untouched, and the serial, trial and user presets carry over.

How it works

  • Every grain gets its own lowpass filter and drive stage, with coefficients locked at spawn, so resonance rings per grain rather than across the whole output.
  • Also new in 4.0.0: A RANDOM card with per-grain jitter for pitch, size, level, shape, reverse and filter cutoff, each on its own knob and each a modulation target.
  • Independent PRE and POST filters, each with its own HP/LP cutoff, resonance, on/off and slopes of 12, 24, 36 or 48 dB per octave.
  • Grains start inside it and stay inside it, and when a grain wants more audio than the selection holds, it loops with a crossfaded splice.
  • Either edge of the selection can be dragged to trim one side, both edges are modulation targets, and a selection shrunk to a sliver becomes a pitched micro-loop.

What to take from it

A new GRAIN SHAPE editor draws the per-grain envelope as a curve: tilted one way it plucks, the other way it swells into a hard stop, and pushed up it flattens. The grain pool is now 64 grains, four times the previous version, and DENSITY reaches 200 grains per second.

Details worth keeping

The selection drawn on the waveform is exactly what the grains play. A third LFO and a third envelope, with a MIDI...

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