The perfect reference tool

L4Fontane AB Reference is a streamlined signal comparison utility designed to bring professional referencing workflows to every producer’s studio. Utilizing a streamlined single-sidechain routing system, it allows you to switch instantly between your current mix and your reference track with total sonic integrity. This focused approach provides the essential transparency and speed needed to make accurate A/B comparisons without complex routing setups
This free edition provides the core tools you need to stop guessing and start hearing the truth behind your mix. By eliminating the “louder is better” bias, L4Fontane AB Reference ensures that your tonal decisions are accurate and aligned with industry standards. It is the perfect entry point for those looking to improve their mixing accuracy and achieve more professional results in seconds—completely free of charge.
teaser video
Watch the quick teaser video to see the bundle features
POWERFULL TOOLS AND MODE

expanded MODE (Default)
The complete command center. Your default window with 2 easily accessible reference monitoring buttons, ideal for starting your session.

compact MODE
When screen real estate is at a premium, Compact Mode takes the stage. A minimalist interface with just 4 buttons (2 references + 1 return button + bypass), keeping you focused on what matters: the music.
product Specifications
Professional Metering & Stereo Analysis
Real-World Data Integration: Gain full confidence that your mix will translate perfectly across all playback systems using industry-standard metering.
Loudness Under Control: Equipped with high-precision RMS and LUFS meters, allowing you to match the perceived loudness between your mix and your reference tracks for an unbiased A/B comparison.
Stereo Imaging & Phase Safety: Features a real-time Stereo Correlation Meter to instantly identify phase issues, ensuring your production remains 100% mono-compatible and wide on the soundstage.
Compatibility & Formats
Windows:
Format: VST3 (64-bit).
OS: Windows 10 or 11.
macOS:
Format: Audio Unit (AU) and VST3 (64-bit).
Architecture: Universal Binary (Intel and Apple Silicon M1/M2/M3 native support).
OS: macOS 10.13 or higher.
Pro Tools:
Format: AAX compatible via external hosts/wrappers (e.g., Blue Cat’s PatchWork or Metaplugin).