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"Scaler 2 makes complex music theory invisible and easy. It substantially expands the harmonic spectrum of all my tracks, whatever genre I am working on."Rodriguez Jr.. Award-winning music producer and live performer.

‘Scaler EQ is a valuable tool for musicians, producers and audio professionals. It just might be the only EQ you need going forward’24bit Electronic Music Production. The place where electronic music production becomes your playground

"It’s an honour to be a part of 'Scaler', it’s awesome!"CeCe Rogers. American Singer, Songwriter & Record Producer
The Scaler 3 & Scaler EQ Bundle is an exclusive offering from us at Plugin Boutique, designed to revolutionize your composition and mixing workflow.
With Scaler 3, you unlock the power of intelligent harmony and chord progression, making songwriting effortless. Whether you're looking to build dynamic progressions, explore complex modulation pathways, or experiment with new voicings, Scaler 3 provides an intuitive and flexible solution. With its advanced VST/AU hosting, multi-lane timeline, and an extensive library of Motions, Scaler 3 empowers producers and musicians to craft expressive, harmonically rich music with ease.
Paired with Scaler EQ, this bundle delivers the first truly musical EQ—a groundbreaking tool that enhances frequencies in key with your track while suppressing out-of-key elements. Unlike traditional equalizers, Scaler EQ ensures every boost and cut maintains harmonic integrity, offering warmer lows, clearer mids, and sweeter highs. Featuring dynamic bands, mid/side processing, stereo enhancements, and key detection, it provides both precision mixing and creative tonal shaping.
Whether you're composing, mixing, mastering, or DJing, the Scaler 3 & Scaler EQ Bundle is a must-have toolkit for achieving professional, musically cohesive results.
Re-imagined and Powered Up
Scaler 3 makes it easier to take new directions, solve musical puzzles, and improve your works-in-progress in completely new ways.
Build Progressions
Drag and drop chords to build a progression. Choose from hundreds of chord sets categorised by artist and mood, and Scaler will be able to tell you which parent scales fit well with those chords. Stuck for ideas? Ask Scaler to suggest chords that will work next.
VST/AU Hosting
Load your favourite third-party instrument and effect plugins directly onto Chord Tracks and MIDI Lanes, with full support for both MIDI and audio effects. Seamlessly integrate your sounds and expand Scaler 3's creative potential within your workflow.
Multi-Lane Timeline
The Arrange page now includes a timeline-based layout with dedicated lanes for chords, melody, bass, and phrases. Each lane is synchronized with the main chord track, and clips are fully adjustable with independent control per lane or clip.
Standalone App
Scaler 3 can now run as a standalone app for Mac and Windows in addition to a plugin within any DAW, offering a complete and flexible songwriting tool with multitrack operation and plugin hosting.
Explore Page
Discover a Harmonic Universe of chords untied to any specific scale. Categorized by genre and feel (EG, Dark, Bright, Neutral), the Explore page suggests compatible and experimental chord progressions, unlocking new paths for unique and bold harmonic structures.
Colors Page
Explore a comprehensive view of all chord voicings and harmonic alternatives in a single, unified page. Instantly access parallel and relative chords, as well as diverse voicing and substitution options, to add expressivity and creative flexibility to your compositions.
Motions
Scaler's beloved Phrases, Performances, Melodies, and Basslines are reimagined as Motions, now with mood-based tags for easier browsing. Scaler 3 introduces hundreds of new Motions crafted by professional musicians, including the all-new Passages Motion.
Circle of Fifths
Get alternative chords for your progression. Choose a root note that's closer or further from your selected chord, or in a relative minor or major scale, and you'll see which variations of that chord fit with your current scale in blue. You can experiment with chord inversions and transpositions here too.
Modulation Pathways
Get alternative chords for your progression. Choose a root note that's closer or further from your selected chord, or in a relative minor or major scale, and you'll see which variations of that chord fit with your current scale in blue. You can experiment with chord inversions and transpositions here too.
Note Editing & Harmonic Modifiers
Get alternative chords for your progression. Choose a root note that's closer or further from your selected chord, or in a relative minor or major scale, and you'll see which variations of that chord fit with your current scale in blue. You can experiment with chord inversions and transpositions here too.
Features
- 100s of Chord Sets and Scales categorised by mood, artist and genre. Scaler 3 greatly expands the number of chord sets and makes them easier to work with.
- Build Chord Progressions using the sequencer and get suggestions based on your currently selected chords.
- Play your favourite instruments with VST/AU Plugin Hosting, including effects too.
- With powerful Detection of MIDI and audio, Scaler can determine what key and scale you’re in and suggest chords that match your music.
- Standalone mode for working on your desktop computer without needing a DAW.
- Huge library of Motions lets you play chords as melodies, arpeggios, basslines and strums, and to modify them using the piano roll editor and global Note Properties..
- Check the Circle of Fifths to find nearby chord substitutions and their extensions.
- Solve your modulation puzzles in five ways: Progression, Secondary Scale, Modal Interchange, Mediants, Neo-Riemannian.
- Experiment with Voice Grouping to keep your chords within a certain range or apply drop voicings, guitar voicing and more.
- 50 Internal Sounds to play your inputs, chords and progressions, or load VST/AU instrument plugins.
- Use Bind to Keyboard to control chord playback with notes, for one-finger chords, arpeggios and more.
- Discover new chord expressions – chord substitutions, inversions, variations, voicings and extensions – in the Colors page.
- Line up seven progressions with different motions to compare in the Sketch Pad page.
Learn more about Scaler 3
The World's First Truly Musical EQ
ollowing on from the award-winning Scaler music theory plugin, Scaler EQ offers a remarkable new way to EQ with musicality and colour.
By enhancing only note frequencies in key with your song, and reducing only note frequencies that aren’t, Scaler EQ can provide a new spin on working with cuts and boosts, increasing the tonality behind your music and providing new harmonic avenues.
And for when you just want a regular, fully-featured, modern EQ, Scaler EQ has you covered with its familiar workflow, large choice of band types, mid/side operation, dynamic bands, peak limiters, and stereo enhancement. You can easily apply classic mixing and mastering techniques used by professionals, with an extra optional musical edge.
What can Scaler EQ be used for?
- Music Production: Ideal for musicians and producers looking to enhance the musicality of their tracks by ensuring all instruments are in harmony with the chosen scale.
- Audio Editing: Simplify EQ processes by targeting and cleaning up frequency bands to remove audio that doesn’t belong and enhance audio naturally present with the chosen scale.
- Audio Engineering: Dynamically soothe audio by suppressing in-harmonic frequencies or expanding harmonic frequencies using dynamic compression and expansion.
- Mastering: Place on your master channel to broaden your stereo width, focus your bass, increase loudness, and enhance your mix.
- DJing: DJs can use it to ensure that the tracks they mix are in harmony by detecting the key and scale whilst balancing the mix of each track.
The World’s First In-Key EQ
Thanks to its Harmonic Peak and ‘Plus/Minus’ filter types, performing a boost on Scaler EQ means only boosting frequencies that are in-key with the currently set scale. Making a cut with the same band will reduce only the out-of-key frequencies – although it can be set to cut in-key frequencies too, which can be helpful for mixing.
By using in-key EQ, you’ll get warmer lows and sweeter highs when boosting, while out-of-key cuts will lead to clearer, more focused bass and less harsh highs that retain their musicality.
Scaler EQ 1.1 Changelog:
- Assignable Scale Switches (ability to switch scales for key changes and key modulation)
- Adjustable Input And Output Levels With Peak And RMS Levels
- Input And Output Peak Limiters
- Sidechain Input for Dynamic Compressor
- Closable Panels
- New Master Limiter Presets
- New Sidechain Input Preset
Features
- Patent pending musical EQ with harmonic band types that boost in-key frequencies and cut out-of-key frequencies
- Familiar EQ controls translate to a regular workflow – but one that adds more colour
- Choice of band types for traditional boost/cut EQ or harmonic EQ
- Magic Shelf bands deliver punchier low end and smoother highs
- Key detection sets the EQ’s target scale
- Dial in dynamics for any band (Threshold, Ratio, Attack, Release)
- Add or remove scale notes for a specific colour (eg, four-note chords or just fifths)
- Creative unique EQ responses by combining magic shelves, harmonic filters and cuts
- Each band can be set to work on stereo, mid or side channels
- Enhance stereo width and collapse low frequencies to mono
- Minimum phase, zero latency EQ
- Available for Mac and PC in VST2, VST3, AU and AAX formats
Learn more about Scaler EQ.
Scaler 2 System Requirements
macOS
- macOS 10.14 or higher. (macOS 10.15+ when used via Beatport Studo)
- Natively compatible with Apple Silicon
- Plugin Formats: VST, VST3, AU, AAX
- DAW's Supported: Ableton Live, Pro Tools, Logic Pro, FL Studio, Cubase, Studio One, Bitwig, Reaper, Reason + more.
- Compatibility: 64-bit compatible only.
Windows
- Windows 8 or higher (Windows 8.1+ when used via Beatport Studo)
- Plugin formats: VST, VST3, AAX
- DAWs supported: Ableton Live, Pro Tools, FL Studio, Cubase, Studio One, Bitwig, Reaper, Reason + more.
- Compatibility: 64-bit compatible only.
MIDI Routing Notes:
- Maschine 2 (No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing)
- Reason (No MIDI Routing: Use Blue Cat Audio Patchwork for MIDI Routing)
- FL Studio (VST, not VST3, MIDI routing available from VST2 only)
Important Notes:
- Scaler 2 is not available in standalone mode and is DAW compatible in accordance with those listed above.
- Scaler 2 for iOS is not included and is only available through the Apple app store.
- When purchasing this software via a Rent to Own plan or Beatport Studio membership, it can only be installed and run via the Beatport Access portal where an internet connection is required at all times.
Scaler EQ System Requirements
macOS
- macOS 10.14 or higher.
- Natively compatible with Apple Silicon
- Plugin Formats: VST, VST3, AU, AAX, Standalone
- DAW's Supported: Ableton Live, Pro Tools, Logic Pro, FL Studio, Cubase, Nuendo, Reaper, Reason + more.
- Compatibility: 64-bit compatible only.
Windows
- Windows 7 or higher
- Plugin formats: VST, VST3, AAX, Standalone
- DAWs supported: Ableton Live, Pro Tools, FL Studio, Cubase, Nuendo, Reaper, Reason + more.
- Compatibility: 64-bit and 32-bit compatible.
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.
Awards

Product Reviews
Plugin Boutique Scaler 2 Review at HomeStudioToday
PluginBoutique has just released a new version of Scaler, their popular music theory and songwriting tool. Let’s take an in-depth look at Scaler 2...
Plugin Boutique Scaler 2 Review at Music Tech
A solid chord progression can enhance even the simplest of tracks and turn them into something truly magical. This Scaler sequel from Brighton’s...
Plugin Boutique Scaler 2 Review at Sound On Sound
Scaler 2 is just the thing to get you out of a songwriting rut. A little music theory can be really useful in the compositional stage of a project,...
Plugin Boutique Scaler 2 review at Producer Sphere
Plugin Boutique Scaler 2 | An HONEST Review Sound Quality - 5/5 Ease of Use - 5/5 Features - 4.5/5 Prior to the turn of the century, if you were to...