reFX built its name on Nexus — a rompler that producers love precisely because it keeps sound design out of the way. Rippler is the opposite bet entirely, and it’s a genuinely surprising pivot.
Announced and now available, reFX Rippler is a dual-layer physical modeling synthesizer combining resonator-based acoustic simulation with a full subtractive layer. The pitch: emulate acoustic instruments both real and imagined, then use oscillators, 27-mode filters, per-layer effects chains, deep modulation, and an arpeggiator to push them somewhere new. At an introductory price of $99, it’s also priced to compete directly with the instruments that inspired it.
A Signal Chain Worth Understanding
Rippler’s architecture runs in a logical physical direction, and it’s worth tracing. The signal starts at the Exciters — the initial energy source that sets acoustic objects vibrating. There are two, with a choice of built-in exciter types, user sample import, and a sidechain input to feed external audio directly into the chain. That last option is the one the press materials gloss over, but it opens up some genuinely interesting territory: route a drum bus or vocal through the Exciter stage and let Rippler’s resonators color it. It stops being a preset instrument and starts behaving like a sophisticated processing tool.
From there, the Exciter signal and a Noise Generator feed into two Resonators — the physical modeling core. Twelve models to choose from: String, Beam, Squared, Bell, Membrane, Plate, Drumhead, Djembe, Vibraphone, Marimba, Closed Tube, and Open Tube, plus a Manual mode that opens an additive synthesis generator for building your own resonant object. Resonators can run in parallel or in series, where they feed back into each other — a routing option that shifts the tonal character significantly depending on the load order and the models in use.
Two wavefolding Oscillators sit after the resonator stage, available to blend and layer with the acoustic signal rather than replace it. This is the “subtractive layer” that reFX describes: use the oscillators to reinforce, thicken, or fundamentally alter the resonator output rather than running them as a separate synth voice.
Filters and Modulation
Two filters modify the combined output of all of Rippler’s sound-producing elements, with 27 types spanning standard low-, high-, band-pass, and notch options, vintage filter types, ladder variants, and a Vowel filter for formant-shifting effects. Series or parallel routing, with input selection available. For a physical modeling instrument, having a Vowel filter in the chain is a considered choice — formant movement on top of resonant acoustic models is the fastest route to something that sounds organic without being literal.
Modulation runs four envelopes — ADSR, AHD, DADSR, and DAHDSR — and four LFOs. Random generators of various types, Velocity, Key, and Aftertouch sources, four macros, and full MPE controller compatibility round out the modulation architecture. Physical modeling and MPE are a natural pairing: MPE’s per-note pressure, pitch bend, and slide map cleanly onto the continuous physical gestures that change how an acoustic object actually resonates. It’s the difference between a static patch and something that breathes.
Effects
Each of Rippler’s two layers — A and B — runs its own dedicated effects chain, with 13 processors to choose from per layer. A Master chain then processes the combined output of both. Three processing stages is not overkill here, but CPU load is worth monitoring: physical modeling resonators are already computationally heavier than standard subtractive synthesis. Running dual independent chains on top of that will test slower machines, particularly with complex modulation active.
The arpeggiator takes incoming MIDI chord notes and plays them in sequence in standard shapes and orders, extended by two modifier lanes — pitch offset in the top lane, velocity offset in the bottom. It’s not a full step sequencer, but on pitched percussion patches and mallet sounds, these lanes offer enough variation to make patterns feel less mechanical.
Hundreds of Presets, and the Usual Question
reFX ships Rippler with hundreds of presets. That’s expected for a commercial release at this level, and for a complex instrument with a steep feature surface, a strong preset library is genuinely useful as a starting point. The question — unavoidable given Nexus’s history — is whether reFX follows the expansion pack model and gates the most compelling sound categories behind paid add-ons post-launch. At $99 introductory, the base instrument is priced fairly. Whether that holds once the content library starts expanding is the thing to watch.
Pricing and Availability
reFX Rippler is available now at an introductory price of $99, rising to $129 after 13th September 2026. Available as VST, Audio Units, and AAX for macOS 10.13 and above (Apple Silicon and Intel native) and Windows 10 and above. Full technical specifications at refx.com/rippler.
