SUS4 apps · plugins
Make music better
22 apps to practise, write and learn, and 25 AU/VST3 plugins for mixes that sound finished. Built in a working studio.
SUS4 · Music apps & studio-grade plugins
Music tools that make you better.Tracks that sound finished.
Built in a working UK studio: 22 apps help you practise, write and learn; 25 AU/VST3 plugins give your mixes a clear, polished, release-ready sound.
Made in the UK22 apps · 25 pluginsAU · VST3 · iOS · Mac
For artists · studio and label
Work with us
We work with you to get your music out into the world: write, record on camera, release in stereo and Dolby Atmos, and keep growing with the people who love it.
Recording · Songwriting · Atmos
Record here
A boutique recording and songwriting studio in a quiet village with views over fields and hills. A 1904 Steinway Model K, brass, strings, a full drum kit, and ribbon and vintage-style microphones in a fully treated live room. Dolby Atmos mixing room for releases at any format. We work with you to get your music out into the world. The focus is on the music, not the clock.
Inside the studio
Real sessions, real room
A look inside the live room and control room. Every session here is filmed from several angles while you play, so you leave with a performance film and clips for your socials. How session filming works.
The Label
Artists
4chordsStudios is a label that works with its artists from the first session to release: your music released everywhere, including Dolby Atmos on Apple Music, with CD and vinyl editions, session musicians, and your own merch store on 4chords.studio.
SUS4 Practice · iOS · iPadOS · macOS · watchOS
The music-practice game you actually want to open.
250 levels across 25 themed worlds, with a boss level at the end of every world. Six game modes that listen through the mic as you play: Pitch Jumper, Arpeggio Maze, Interval Invaders, Rhythm Runner, Technique Drill and Finger Independence. Step-by-step lessons for 15 instruments, a daily routine, and level packs for Jazz, Latin, Metal, Blues and Classical. Game Center leaderboards and achievements keep it competitive, and quick ear drills come with you on Apple Watch.
- 250 levels · 25 worlds
- Boss levels
- 6 game modes
- 15 instruments
- Game Center
- Apple Watch
250Levels
25Worlds
6Game modes
25Bosses
SUS4 Apps · iPhone · iPad · Mac
Flagship apps
22 focused music tools on the App Store. The 3 below sit at the top of the range, built for musicians who are serious about getting better and getting things done.
FlagshipSUS4 Practice
250 levels across 25 themed worlds, with a boss at the end of each. Six game modes that listen as you play your own instrument, plus step-by-step lessons for 15 instruments.
FlagshipSUS4 Score
Photograph printed sheet music or open a PDF or MusicXML file, and SUS4 Score turns it into notation you can play back. The scan flags the notes it is unsure of so you can check and fix them.
FlagshipSUS4 Transcribe
Import a recording and see its key, tempo, notes and chords, turned into tab you can play from, without the guesswork.
SUS4 Plugins · AU · VST3
Studio-grade processors
25 pro plugins in one bundle. Each behaves perfectly, until you flip its Sus switch and it does something it was never meant to: a compressor that gets louder where it should duck, a reverb that swells before the note. Weird, on purpose, and somehow musical.
COMP
SUS4 Aurum 670
Flip Sus and it glues your whole mix into one slow, breathing pull. The kind of weight that makes people lean in without knowing why.
COMP
SUS4 Strike 76
Flip Sus and it’s all bite and attitude. It grabs a part by the scruff and drags it, snarling, to the front of the mix.
CHANNEL
SUS4 Channel Strip
Flip Sus and the whole clean channel goes through the looking-glass. A familiar sound, suddenly unrecognisable and alive.
COMP
SUS4 Lume 2A
Flip Sus and it rides your vocal into a slow, living swell. It breathes with the performance instead of pinning it down.
COMP
SUS4 Bond 609
Flip Sus and it stops holding the mix still and starts shoving it forward. Pure energy and urgency, leaning right at the listener.
EQ
SUS4 ParametricEQ
Flip Sus and it turns into an EQ that pushes back. Boosts where you cut, rings where you push, and still sounds musical doing it.
The Sus switch · on every single plugin
Every sound you love broke a rule first.
“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
Get in touch
Questions, projects, or just curious?
Whether you want to record, release, use the apps, or understand the plugins, the right place to start is a short note.