iFeature RIVE 1.0.0

RIVE (styled IFEA - RIVE) is a real-time polyphonic harmonic splitter plugin developed by iFeature, described by the developer as the first real-time polyphonic harmonic splitter that separates any sound into its odd, even, and inharmonic components with precision. Available as an AU and VST3 plugin for macOS and Windows, RIVE requires macOS 10.13 (High Sierra) or later, distributed as a Universal 2 Binary directly through the official ifeature.world website with a free trial available before purchase. Version 1.0.0 was RIVE's initial release, positioned by the developer as "Fusion's faster, sharper sibling" — a leaner, more immediate-feeling companion to iFeature's earlier Fusion plugin, built for fast, hands-on control during mixing and creative sound design. What makes RIVE distinctive is that it operates in real time with remarkably low CPU overhead (around 2%) while performing a task — true harmonic decomposition — normally associated with heavy, offline spectral processing. Rather than treating a sound as one undifferentiated signal, RIVE splits it into three independently controllable components: Odd harmonics (the odd-numbered partials — 1, 3, 5, 7, and so on — that form the core structure of many waveforms, resembling a square wave when isolated), Even harmonics (the even-numbered partials that shape a sound's brightness and edge, similar to a saw wave an octave higher when boosted), and Inhar (all non-harmonic content — noise, transients, and overtones the pitch tracker can't detect — adding texture, air, and metallic character without touching pitched harmonics). A dedicated Form control also shifts formants up to +12 or -12 without affecting pitch, and the plugin runs monophonically or polyphonically up to 8 voices.

Open your DAW and load RIVE on a track needing harmonic control. Adjust the Odd and Even harmonic sliders independently to reshape a sound's core structure and brightness. Use the Inhar control to bring out or tame non-harmonic texture, noise, and transient content. Apply Form to shift the perceived vocal or body resonance up or down without altering pitch. Switch between monophonic and polyphonic (up to 8 voices) operation depending on your source material. Resize the plugin window by dragging any corner to fit your preferred workflow and screen setup.