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ERA 4 Voice Leveler
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Rio lorenzo plugin boutique
"This plugin has exponentially improved my workflow, and is my starting point for all new productions."
. Trance and House producer who has released music through AVA Recordings and Sereno. Lorenzo has also crafted his own synth presets, available through Loopmasters and SoundSpot.
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"A useful, great value plug-in to help you easily explore new progressions."
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"A must for anyone who struggles with chord structures, needs fast workflow, or makes music on the go a lot."
. UK Bass Music Producer: Critical Music, Planet Mu, Bassbin.

Buy Scaler 1 & Get a FREE Upgrade to version 2

(Release May 27th)

Note: The free upgrade is only available for users who purchased Scaler between May13th-26th 2020

The Creative Chord Composer

Scaler is a unique and inspirational MIDI effect that makes finding chords and progressions intuitive and fun! With note detection, scale selection and chord suggestions, Scaler is a comprehensive but easy-to-use toolbox that will help anyone make better music.

A first of its kind, Scaler can determine what key and scale you’re in and suggest chords that match your music, or it can inspire a tune from scratch by providing a set of initial chords in an unexplored key. With the onboard bank of over 2,000 scales and modes including genre and artist presets, there’s more than enough to keep the juices flowing.

Once you’ve determined a scale, Scaler lays out basic diatonic chords for you to audition, and lets you take things further with dozens of chord variations and voicings to try out. Theory buffs can also get an insight into each chord’s harmonic function.

Ready to put together a progression? Simply drag and drop chords into Scaler’s sequencer, change up octaves and inversions, edit the voicing, and record or drag the progression into your DAW.


  • Discover your music’s key and explore alternative scales and chord sets
  • Choose from hundreds of keys, and get the harmonic flavours of pro artists
  • Easily audition chords and find alternative voicings and common substitutions
  • Quickly build intelligent progressions by dragging chords into Scaler’s chord sequencer
  • Drag chords and progressions from anywhere in the plugin out to your DAW


  • Discover your track’s current scale with MIDI keyboard or piano roll note detection
  • Get an insight into the emotional content of matching scales
  • 12 keys across 23 scales and modes giving you a total of 276 options to choose from 
  • 12 unique voicing types giving you a potential of over 2,000 Scales and modes 
  • Over 100 artist chord sets from the likes of Carl Cox, MJ Cole, The Temper Trap, Mitekiss, CeCe Rogers and Mike Huckaby
  • Over 100 genre and mood-based chord sets such as Chill, Drum & Bass, Jazz, Cinematic, EDM…
  • Check how closely a given scale matches your detected input


  • Keep an eye on notes and chords going through Scaler with real-time visual feedback 
  • Visualise the chosen scale as highlighted notes on Scaler’s piano keyboard or guitar fretboard 
  • Audition chords from your chosen scale with a choice of eight internal sounds
  • Play and record one-finger chords using Scaler’s Bind MIDI function
  • Use the arpeggio or strum features to perform in real time and synced to your DAW
  • Assign any VST / AU instrument to Scaler to control your favourite synths


  • See the basic diatonic chords that can be built from your chosen scale
  • Browse Chord Variations for each note to get suspended chords, extended chords, dominant sevenths and jazz chords
  • Quickly get a sense of each chord’s harmonic function in progressions
  • Discover chord substitutions that lend variety to your progressions
  • Experiment with different chord voicings to spread notes across the keyboard
  • Mix and match from hundreds of artist and genre-based chord sets


  • Drag and drop chords from your palette into Scaler’s Progression Builder
  • Edit, transpose and invert chords for even more voicing styles
  • Audition your progressions and make changes with drag-and-drop
  • Save your own chord sets to the preset bank for later use
  • Export MIDI to your DAW simply by dragging and dropping

How Does It Work?

Scaler is a plugin instrument capable of outputting MIDI as well as audio. With regard to the latter, a piano, guitars, strings and several sampled synth sounds are built in for scratch work, so you can quickly get a chord progression together for export as a MIDI file entirely within it. 

Obviously, though, the idea is to trigger other instruments via Scaler, and how this is set up depends on the host DAW. For VST hosts, Scaler loads as an instrument plugin onto a MIDI track, the output of which is sent to a second track (hosting the target instrument) using the DAW’s routing system. 

For Audio Unit hosts (ie, Logic Pro), the included ScalerControl MIDI effect plugin is loaded up instead. This is identical to the regular Scaler, but sits in front of the target instrument on the same track, outputting MIDI directly to it. It’s certainly the more elegant of the two approaches, although it only captures the raw triggering notes to the track, not the chords output by the plugin.

New Features in Version 1.8.1

  • New Scales: Added support for Double Harmonic Major scale and its modes.
  • 6 New Tunings: Added support for baritone guitar tunings.
  • State Export/Import: Save the state of Scaler to a file and import your session in another instance easily.
  • Improvements & Bug fixes:
    • Scaler now correctly recalls the sound output on/off value from the saved state.
    • Fix a crash when updating the playback octave of the chords of a pentatonic scale.
    • Virtual keyboard now gets keyboard focus when entering chord edit mode.
    • Alt-click on the Scaler logo now resizes Scaler to its smallest supported size.

New Features in Version 1.8

  • 40 New Chord Sets: R&B, Synthwave & New Artists Chord Sets
  • 3 New Synth Sounds: Dusty Nostalgia, HeavyHitter & SqSaw
  • 3 New Pads Sounds: DreamOn, SteelyEssence & WidePad
  • 5 New Arpeggio modes: Up/Down Repeat, Down/Up, Down/Up Repeat, Doubled Up, Doubled Down
  • “Random” strumming mode: Randomly switch between strumming up and down.
  • Copy/Paste Voicing: Extract the voicing of any chord and apply it onto another chord to match the number of voices and octave at which it will playback.
  • Voicing Lock: Preview any chord using one of 2 modes:
    • Dynamic Grouping: Play chords within the same area of the keyboard to maximise compatibility by automatically choosing voices and inversions.
    • Extracted Voicing: Preview any chord in Scaler with the last voicing you extracted.
  • New Arpeggio Note Length: Perform Arpeggio in full, half and quarter notes to emulate a staccato effect
  • Bug fixes and performance improvements

New Features in Version 1.7

Scaler 1.7 introduces several new user requested features, enhancements and bug fixes. There are 30 new Blues, Latin and Bossa Nova chord sets and over one hundred new scales including all the modes of the melodic and harmonic minor scales. You can now re-detect from the chord builder and you can preview chord sets with one click or copy all chord sets to the builder with one click. Scaler 1.7 also includes 5 new Bass tunings for the Fretboard and quickly allows for chord expansion by adding 7th, 9th, 11th and 13th to entire chord sets.

  • Over one hundred new chord sets including all the modes of the harmonic and melodic minor scales. 
  • 30 New Chord Sets: Blues, Latin & Bossa Nova
  • 5 New Bass Tunings: Fretboard now supports bass tunings with 4,5 and 6 strings. 
  • Re-Detect from builder: Find which scale fits your progression anytime in your creative process.
  • Preview chord sets: Play through any progression preset in one click.
  • Copy-to-Builder: Move all chords from a progression directly into the builder for a faster editing.
  • Diatonic chords improvements: Quickly navigate between triads, 7th, 9th, 11th, 13th chords of any scale.
  • Improved chord naming: More chord definitions and simplification of existing chord names for improved readability.
  • Small screen support: Allow smaller UI resizing to support smaller screens and resolutions.
  • Bug fixes and performance improvements

New Features in Version 1.6

  • Improved Drag & Drop: Export strums and arpeggio simply by dragging a chord or progression to your DAW.
  • Scale Lock: New Scale-Lock mode - Map any scale to the white keys.
  • 10 New Chord Sets: Cinematic - Horror & Suspense
  • Arpeggio Sync: Arpeggio now syncs with your DAW.
  • 2 New Sounds: Electric Piano & Brass Ensemble.
  • Improved Strumming: Set your preferred strumming direction (Alternate/Up/Down) & discover a new (slower) strumming profile.
  • Bug fixes and performance improvements.

New Features in Version 1.5

  • Fretboard Display: Designed in conjunction with world-leading guitarist Joseph Greer from the ‘The Temper Trap’.
  • Arpeggio and Strum performers: Fully fledged arpeggio and strum features to greatly enhance live performance.
  • Scale Lock: Effortlessly create melodies locked to the scale of your currently selected chord set.
  • Chord Editing: Edit existing chords or create new chords from scratch using the keyboard or fretboard display.
  • Parallel Harmony: Generate instant parallel harmony by selecting your favourite chord and laying it out across the keyboard.
  • Relative Chord Finder: Transpose chords by any diatonic or non-diatonic interval whilst retaining their shape.
  • Scale Explorer: Explore scales that contain the currently selected chord - great for modulation.
  • Undo Redo: Undo or redo chord and voicing edits in your progression builder.
  • Multi-Select: Select multiple chords in any order to drag and drop to the progression builder.
  • 21 New Genre and Artist Based ChordSets: The Temper Trap, Mitekiss, Royalston, Joseph Greer, deliBass, Matt Ridgeway, and new Cinematic chord set
  • 4 New Internal Sounds: Electric Guitar, String Ensemble, Acoustic Guitar, Harmonic Guitar

New Features in Version 1.2

  • Humanise Velocities: the velocity of each note within chords is randomised to provide a more natural playing style.
  • MIDI Export Length: select length of MIDI notes for export and drag and drop.
  • Improved Progression Builder: Now handles up to 16 chords & chord progression is now played at DAW tempo.
  • 21 New ChordSets: Classical (8), K-Pop / J-Pop (6), Neo Soul (6)
  • 11 New Scales: Lydian augmented scale, Acoustic scale, Major locrian scale, Ukrainian dorian scale, Hungarian gipsy scale, Melodic minor scale (asc), Half-diminished scale, Phrygian dominant scale, Persian scale, Neapolitan major scale, Neapolitan minor scale

New Features in Version 1.1

  • Change Bound Octave: Choose which octave to bind to trigger chords directly from the bind MIDI button.
  • Split Keyboard: Ability to play second line when midi bind is active.
  • Accompaniment: You can now play a melody line or bass line along the chords you trigger through Scaler.
  • MIDI CC Through: Scaler now allows MIDI CC message pass through for better control of your external instruments.
  • Trigger Multiple Chords Simultaneously: Trigger multiple chords at once and create complex harmony by combining different voicings.
  • 10 New ChordSets: EDM (5), Drum & Bass (5)

System Requirements


  • OS X 10.7 and later (64-bit compatible only)


  • AAX
  • Audio Units (AU)
  • VST


  • Windows 7 and later (32 and 64-bit compatible)


  • AAX 
  • VST

Scaler 1.8.1 Compatibility


  • FL Studio 12 - OK
  • FL Studio 20 -  OK (MIDI routing available from VST2 only)
  • Cubase 9.5 - OK
  • ProTools 12.8 - OK
  • Studio One 3 - OK
  • Studio One 4 - OK
  • Ableton Live 9 - OK
  • Ableton Live 10 - OK
  • Reaper - OK
  • Bitwig Studio 2 - OK
  • Maschine 2 - OK - No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing
  • Reason - OK - No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing


  • Cubase 9.5 - OK
  • ProTools 12.8 - OK
  • FL Studio 12 - OK (VST, not VST3)
  • FL Studio 20 -  OK (MIDI routing available from VST2 only)
  • Studio One 3 - OK
  • Studio One 4 - OK
  • Ableton Live 9 - OK
  • Ableton Live 10 - OK
  • Logic Pro X - OK
  • Reaper - OK
  • Bitwig Studio 2 - OK
  • Maschine 2 - OK - No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing
  • Reason - OK - No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing

Important note: The latest version of Scaler is only 64-bit compatible for Mac computers.

Any references to any brands on this site/page, including reference to brands and instruments, are provided for description purposes only. For example references to instrument brands are provided to describe the sound of the instrument and/or the instrument used in the sample. Plugin Boutique do not have (nor do they claim) any association with or endorsement by these brands. Any goodwill attached to those brands rest with the brand owner. Plugin Boutique or its Suppliers do not accept any liability in relation to the content of the product or the accuracy of the description. "RHODES" is a registered trademark of Joseph A Brandstetter.


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