Orra Filter
Dual Filter & Modulation Matrix
Eight circuits in two cells, routed six ways. Moved by four LFOs, an envelope follower, a sequencer, an ADSR, MIDI velocity, the tracked pitch of the audio, four macros, and other tracks over Orra Link, routed to any cutoff, resonance, drive or morph. Make a route from the matrix tab, by dragging a source onto a knob, or from a knob's right-click menu.
Secure checkout by Lemon Squeezy
Two ideas carry the whole plugin
The cells and the matrix. Everything else follows from these.
Two cells, one routing
Filter 1 and Filter 2 are independent. Each has its own circuit, type, slope, cutoff, resonance and drive, and each can be switched off without leaving the routing. The selector decides how they meet: Series runs one into the other, so a low-pass into a high-pass is a band-pass with two independent edges. Parallel sums them. Mid-Side puts one on the mid and one on the sides. Stereo Split puts them on left and right. Morph crossfades between them under a knob you can modulate.
Everything is a destination
Every cutoff, resonance, drive and FM amount, plus morph, dry/wet and the output gain, can be modulated. A route is a source, a destination, a bipolar depth and a curve, and the destination is offset around wherever its knob already sits, so the knob stays the centre of the motion. Cutoff depths read in octaves. Routes can target other sources too, so an LFO can bend another LFO's rate.
What's inside
The controls, the patches, and what it costs you in CPU and latency
- •Circuit and type selectors per cell, with slopes at 12, 24, 36 and 48 dB
- •Cutoff from 20 Hz to 20 kHz, draggable straight on the response screen
- •Resonance, and a DRIVE stage of up to +24 dB into a tanh shaper with half made back up
- •Key tracking from MIDI notes or from the pitch of the audio itself, with portamento
- •Audio-rate FM of the cutoff from an internal oscillator or from the input
- •ANALOG adds slow independent cutoff drift and a faint noise floor; off is bit-exact
- •OSC lets the ladders self-oscillate past about 95 percent resonance
- •STEREO pulls the left and right cutoffs apart and reads LFOs ahead on one side, so sweeps swirl
- •Four A/B/C/D snapshot banks, undo and redo, UI scale from 75 to 200 percent
- •Hover tips in seven languages
Eight separate circuits
Separate designs with their own behaviour under resonance, drive and key tracking. Each draws its own curve on screen in its own colour, phase included, alongside the combined white line.
Moog
The classic four-stage transistor ladder. Warm, resonant, takes drive well. Low, high and band-pass at 12 to 48 dB, unity passband at every slope, and it sings from about 95 percent resonance with OSC on.
SVF
A clean state-variable filter with little colour of its own. Low, high, band, notch, peak and allpass, with resonance setting the Q. Zero resonance is a Butterworth response, 3 dB down at the knob.
Comb
A short delay with feedback: metallic, robotic, tuned by the cutoff. Positive, negative and a damped allpass. Key-track it and it retunes like a played string. A slow LFO on the cutoff is a flanger.
Formant
Morphs the vowels A, E, I, O, U, with the cutoff as the vowel position and resonance narrowing the formants. Sweep it slowly for talking pads, or route a macro to it and talk by hand.
Diode
A 303-style diode-coupled ladder. Softer slope than the Moog, squelchy, the bass thinning as resonance rises. Squelch lives at 60 to 80 percent; with OSC on it screams at 100.
MS-20
A Sallen-Key with a clipping feedback loop. Aggressive, with a screaming resonance and a characteristic bite as it is driven. Low and high-pass.
Resonator
Four tuned peaks at ratios of the cutoff: Harmonic, Odd, Bell, Fifths, Octaves or Unison. Key-track it and it plays like a body. Drums ring like metal, a voice becomes a choir.
Spectral
Draw the response yourself, then sweep it with the cutoff and peak it with resonance. Linear-phase, about 17 ms of reported latency.
Three ways to route
From the MOD MATRIX tab, by dragging a source tab or a macro label onto any knob or cutoff handle on the response screen, or from a knob's right-click menu. Dragging opens a small callout for depth and curve; the right-click menu shows a live depth slider for every route already on that knob.
The screen shades how far each cutoff is being swept, knobs draw a ghost ring at the live modulated value, and hovering a modulated knob tells you what is moving it.
Four LFOs
Free or tempo-locked, seven shapes including a drawable custom curve, with feel, swing, phase and one-shot modes.
Envelope follower
Listens to the track, the host sidechain, or another track over Orra Link. Band-limit what it hears so it rides the kick and ignores the rest.
16-step sequencer
Locked to the grid, with per-step probability, odd pattern lengths for polyrhythms, and glide between steps.
ADSR
Triggered by MIDI or by the audio’s own transients, so every hit plucks the filter open with no MIDI in the project.
Velocity, pitch and macros
MIDI velocity, the tracked pitch of the input, and four renameable macros you can map to a controller.
What the screen shows
- •Each cell's frequency response and the combined result, phase included, over the input and output spectra
- •Shaded bands showing how far each cutoff is being swept by its modulation
- •Optional 2x or 4x oversampling, with a fixed added latency reported to the host
- •Dry/wet is phase-true even with oversampling on, so a 50/50 blend does not comb-filter
- •Modulation is computed every 32 samples, so a 1/32 sequence lands on the grid at any buffer size
Move the filter from another track
Orra Link 2 is the free companion sender bundled in the installer. Drop it on any track and that track appears in Filter's LINK menu by name, in any DAW, with no host routing.
Feed the envelope follower
Point the follower at the kick and the filter on your lead opens or ducks with it, without touching a bus.
Or drive the matrix directly
Link A to D are modulation sources in their own right, so another track's level can move any cutoff, resonance or morph. The factory preset Link-Driven Wobble is a Moog cutoff riding the kick.
Picks survive the session
Stored by track name, so they come back after a reload or a track move. Four picks at once, plus the 36 manual Link channels.
Reading a Link channel sample-accurately costs one host buffer of latency, reported to the host. With no pick assigned there is none.
Orra Link 2
Sidechain sender, bundled in the installer of every compatible Orra product
Get Orra Filter
Eight circuits, two cells, six routings, and a modulation matrix.
Secure checkout by Lemon Squeezy · Includes Orra Link
Pairs well with
Orra Collider
Roll a complete patch with one button, then run it into Filter. A Moog ladder on a Collider pad, with the sequencer on the cutoff, is most of a track.
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16 bands of parametric EQ with per-band saturation. Where Filter shapes and moves a sound, EQ places it, so the two sit either side of the same job.
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