Sonic Cat Purity v1.4.6 [MAC]

• Product: Purity
• Developer: Sonic Cat
• Version: 1.4.6
• Format: VST, AU
• Requirements: macOS 10.9 or later
• Source: sonic-cat.com/purity

Purity is a 16-part multitimbral PCM sound module — a ROMpler — built around a factory library of over 1,600 presets played back through an integrated mixer, pattern sequencer, and 24 insert effects. It runs as a VST2.4 instrument on Windows and an AU2 instrument on Mac, without a VST3 or AAX build. Producers load it for fast, preset-driven sketching in hip-hop, trap, PluggnB, and similar genres, trading deep sound-design control for a workstation-style layout descended from 2000s-era hardware ROMplers, at a sub-70MB footprint.

Key Takeaway

Purity’s value is speed: a huge factory-preset library, glitch-free live patch switching, and a mixer/sequencer/effects workstation at a tiny CPU and disk footprint, built for producers who want a finished PCM tone fast rather than a deep synthesis engine. It installs only as VST2.4 or AU2, so an all-VST3 host or Pro Tools rig needs a bridge to load it.

Sixteen Parts, One Global Polyphony Pool

Purity runs as a 16-part multitimbral instrument, with each part addressable as its own channel inside an integrated mixer — key and velocity ranges split a single part into separate zones, and a channel link function stacks two or more parts into a single layered patch. Two channel modes, Melody and Drum, set how a part responds to incoming notes, so a rhythm part built for one-shots doesn’t inherit the sustain behavior a melodic pad needs. Every channel routes through one of two stereo output buses — main or sub — before it reaches the host, giving a drum program a separate physical exit from the melodic layers riding the main bus.

Global polyphony caps at 1,024 voices across all 16 parts, with a 64-voice ceiling per individual channel — a number that matters once four or five parts are layered into one patch and a sustained pad starts eating into the voice budget a drum part needs during a fast fill. Two stereo send-return buses, chorus and reverb, sit shared across every channel rather than as per-channel inserts, so every part reaching for reverb draws from the same return rather than an independently tuned space. Channel copy, paste, and swap moves a working setup between parts without rebuilding it by hand, which speeds up building a 16-part template but doesn’t change the shared-bus limitation underneath it.

Producers layering two or three parts into one sound — a pad over a pluck, a sub under a lead — get full use of the channel-link and dual-bus routing. A project trying to run 16 fully independent parts each needing its own distinct reverb space will hit the shared send-return ceiling and need to print stems or reach for a send effect in the host instead.

Nine Colors to Find One Patch

The preset browser holds 1,622 factory presets plus 225 phrases and loops, organized enough that a nine-color patch-recognition system tags each sound by type on sight, so scanning a long list for a specific bass or pad character doesn’t require opening each one to check. Patch changes fire glitch-free while a part is actively sounding, which matters live or when auditioning a bassline against a playing pattern without a dropout between the old patch and the new one. Full computer-keyboard support lets a QWERTY layout stand in for a MIDI controller when auditioning presets away from a keyboard rig.

That library depth is fixed rather than expandable with user-recorded samples — Purity’s own specification lists factory content and separately sold third-party patch packs, not a sample-import path, so building a custom multisample instrument from a personal recording isn’t part of what this browser does. A producer scanning for an era-specific PCM character — the kind that turns up across trap, PluggnB, and hip-hop productions — gets fast, direct access to that character. A producer who needs a rompler that also imports a personal sample library needs a different tool for that half of the job.

Twenty-Four Effects Across Six Families

Each channel routes through insert effects drawn from six families — filters and EQ, compressors and distortion, bit crusher and stereo-image tools, modulation (chorus, flanger, phaser, wah), tremolo and auto-pan, and delay/reverb — 24 types in total available per channel. Stacking a bit crusher ahead of a chorus on the same patch colors the PCM source further before it ever reaches the shared reverb bus, which is where a lot of the instrument’s vintage character gets built rather than in the raw sample playback itself.

The edit panel exposes every effect parameter on one screen without paging between tabs, with a graphic envelope for shaping amplitude over the patch’s length. That single-screen layout speeds up tweaking one parameter mid-audition, since nothing sits a click or two deep the way a tabbed synth interface often does. The tradeoff is screen density: 24 effect types plus a full mixer and envelope editor on one non-paged panel asks more of a small laptop display than a synth that spreads the same controls across separate pages.

Sixty-Four Steps, Five Lanes

The integrated pattern sequencer runs up to 64 steps across 5 lanes, with a rate control that includes triplet timing and a swing option that shifts the underlying grid off a straight sixteenth feel. A latch function keeps a pattern cycling in the background while a part is played live on top of it, which turns the sequencer into a backing loop rather than something that has to be manually restarted every pass.

The sequencer treats melody and drum parts differently by design, following the same Melody/Drum channel-mode split used elsewhere in the mixer, so a drum lane and a melodic lane inside the same pattern don’t behave identically even at the same step count. It runs inside Purity’s own transport rather than reading the host’s timeline directly, so a pattern built here needs to be either played live into the DAW or bounced to audio/MIDI to line up with a host-side arrangement built around bars and markers.

No Path to VST3 or AAX

Purity installs as a VST 2.4 plugin on Windows and an Audio Unit 2 (AU2) plugin on Mac, per its own published system requirements — there’s no VST3 build and no AAX build listed for either platform. A Cubase, Studio One, or other host that has dropped VST2 hosting outright won’t scan Purity into its plugin list without a third-party VST2-to-VST3 bridge sitting between them, and a Pro Tools rig has no native path to it at all.

That format gap sits alongside genuinely low resource demands — a 100MB disk footprint and support back to Windows XP and macOS 10.9 — so the plugin runs on older machines a modern VST3-only instrument wouldn’t touch. A studio built entirely around current-generation VST3 or AAX hosting is the one setup Purity’s installer doesn’t reach without an added third-party bridge in the signal path.

FAQs