4chordsStudiosStart 7-day free trial
AU · VST3 · 25 plugins

Every sound you love broke a rule first.

25 pro plugins. One Sus switch that makes them misbehave, on purpose.

All 25 plugins, one price

7-day free trial · £7.99/month or £99 lifetime also available

The Sus switch · on every single plugin

Off, it’s clean. On, it misbehaves.

“Does that plugin even do anything?” Fair question. Most ‘character’ plugins do so little you couldn’t pick them in a blind test. So we went the other way. Every SUS4 plugin has a Sus switch. Off: the clean processor you trust on every mix. On: it does something it was never meant to. Weird, on purpose, and somehow musical.

  • Compressoryour drums get launched, louder and meaner where they hit hardest
  • Reverbthe room arrives before the note. Haunted, sucked-in, possessed
  • Gatepunches rhythmic, danceable holes through your loudest hits
  • Crimson preampa thin, polite sound grows teeth and starts to snarl
  • Limiterthe ceiling becomes a launch pad. Peaks come back bigger
  • HummingComposerevery chord hangs unresolved. That yearning ache
Flip the switch. Start a 7-day free trial

SUS4 plugins are in public beta

All 25 plugins are live and validated on macOS, Windows and Linux. It’s early. You may still meet the odd rough edge. Tell us what you find and we’ll fix it fast. Your licence and every future update carry straight through to the full release.

All 25 plugins

SUS4 COMPLETE

Every plugin. One subscription.

All 25 SUS4 plugins: every compressor, EQ, gate, reverb, creative tool and instrument. Every platform. Every future update. Cancel any time.

  • 25 plugins, AU + VST3
  • macOS, Windows, Linux
  • Every future release included
  • Cancel any time
£7.99/ month
or £49 / year — save 49%

7-day free trial. Card required, held not charged. Cancel any time before it ends.

The Sus switch · One button. Every plugin.

“Does that plugin even do anything?”
Good. That’s the test.

You’ve seen the threads. Does that gear even do anything, is “character” just snake oil. Fair questions: most “warmth” plugins fail them, doing so little you couldn’t pick them in a blind test. So we went the other way. Flip a Sus switch and a compressor gets louder where it should duck. A reverb swells before the note. A chord hangs and never resolves. Things that shouldn’t work, and absolutely do.

Nobody ever fell in love with a record because it was transparent. They fell for the feel: the pump, the breath, the bite, the thing that shouldn’t work but absolutely does. And nearly every one of those sounds started as someone misusing their gear: a compressor slammed until it pumped, every button jabbed in at once on a unit that was never meant to run that way, an overdriven preamp someone forgot to turn down. Happy accidents became the sound. SUS4 bottles that “what does this do?” instinct and puts it on one switch. On every plugin, on purpose, on your track, every time.

  • On a compressorSometimes it stops being a compressor at all. The detector behaves differently, the timing rewrites itself with the signal, and it can start to feel like a gate, an expander, or something you don’t have a name for yet. All four ratio buttons in, mentally.
  • On an EQStrange and wonderful things. Bands stop being independent. The curve you drew isn’t quite the curve you hear. Sometimes it’s wrong. Sometimes it’s the take.
  • On the opto & vari-mu compressors (Aurum, Lume, Spark)The opto path stops being polite. The 670 snaps shut the instant you cross it and starts to motorboat when you push it; the opto pair swell open late and refuse to let go. Directions the original hardware was never asked to lean.
  • On Crimson preampDrive sits forward. Character that was a hint becomes the point. Clean preamp becomes flattering character box.
  • On DrumAlignSus mode loosens the timing instead of tightening it. It leaves the human feel in, and only nudges the hits that are genuinely off. Pocket back, robot gone.
  • On Channel StripThe signal-flow order changes. Compress before EQ becomes EQ inside drive becomes gate after compression. The strip stops being one thing and starts being a different strip every time you flip it.

There is, after all, something suspicious about the number 4.

Launch offer · the whole bundle

  • £7.99/ month7-day free trial · cancel anytime
  • Launch offer£49/ yearAbout £4 a month · Save 49% · 7-day free trial
  • Founders offer£99onceFirst 50 founders licences at £99, then £149. Pay once, own all 25 forever. No subscription, every future update included.
  • Rent-to-own£9.99/ month for 12 months£119.88 total, then you own all 25 plugins forever — no more charges. Cancel any time; access ends at the end of the paid period, no ownership. Card only, no free trial.

All 25 plugins (compressors, EQs, gates, reverbs, delays, saturation and creative tools) in one bundle, with every future plugin and update included. No marketing machine, no investors to pay back. Just studio owners who wanted these tools to exist, keeping them at a price that actually makes sense.

  • AU + VST3
  • macOS · Windows · Linux
  • pluginval-validated
  • Free updates for life
  • A Sus switch on every plugin

View system requirements & DAW compatibility →

All 25 plugins. Subscribe, or own them outright

A few SUS4 compressors lay out their controls the way classic studio hardware did. Strike 76, Lume 2A, Spark 3A, Bond 609, Crimson and Aurum 670 take their control surface from the units that engineers already know by feel. They are inspired by those control surfaces, not modelled on, affiliated with, or endorsed by any manufacturer. The sound is SUS4’s own. All product names and trademarks are the property of their respective owners and are used only to describe the layout a control recalls.

Why our plugins are different

Made in a working studio

Every SUS4 plugin was shaped on a real mix in a real room. If it didn’t hold up on a session with a real artist, it didn’t ship. No test tones, no perfect sine waves. Real programme material, real ears.

One price. Everything.

One licence gets you all 25 plugins in the SUS4 suite: compressors, EQs, gates, reverbs, creative tools and more. No tier gymnastics, no per-plugin upsells, no surprise charges.

The same look as the apps

SUS4 plugins share the exact design language as the 4chordsStudios iOS and Mac apps: same tokens, same type, same dark studio palette. Your screen stays coherent whether you’re in the DAW or on your phone.

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