Signum Audio’s BUTE Loudness Suite 2 (Surround) is an all-in-one loudness normalization and true peak limiting toolkit for mixing and mastering to broadcast and streaming standards, supporting up to Dolby Atmos 7.1.2.
Purpose and Core Tools
BUTE Loudness Suite 2 (Surround) bundles Bute Normaliser Surround, Bute Limiter 2 Surround, and a loudness meter into a single package. It is designed to help mix and master audio to loudness standards set by streaming and broadcasting platforms, preventing unwanted distortion and overshoots downstream.
The suite uses proprietary algorithms for ultra-transparent True Peak brickwall limiting, automated normalization, and accurate loudness metering. Its interactive graphical interface clearly highlights areas that need attention, helping you balance music, dialogue, and sound effects in stereo or multichannel configurations.
Key Capabilities and Metering
The loudness meter provides accurate True Peak and LUFS readings, with toggles for Absolute/Relative Scale, True Peak/LUFS, and Max/Live modes. A smart history overview lets you view up to 10 hours of content and navigate directly to any section of a track.
A custom alert system flags sections that exceed a user-specified range or any True Peak overshoots. The suite includes industry-standard presets for major platforms and supports custom presets for internal standards, so you can quickly match delivery requirements.
Workflow and Integration
The plugins are compatible with VST, AU, and AAX (including AudioSuite), so they work with most DAWs. The smart auto re-metering feature gives immediate feedback on how mix changes affect loudness, eliminating the need to re-meter the entire mix.
A compact read-out view keeps CPU and screen usage optimized while allowing quick access to display settings and limiting configurations. The interface is fully resizable, making it easy to work on smaller screens without losing essential information.
Limiting and Practical Applications
To stay faithful to your mix, you can adjust pre-gain and select from Transparent, Natural, or Smooth release curves. The release time is calculated automatically based on input signal properties, with a dial for fine-tuning the multiplication factor.
Beyond compliance, BUTE can act as a maximizer to make quieter mixes louder without sacrificing dynamics. It is suitable for long-form content like podcasts or films, where loudness consistency across dialogue and sound effects is critical, and for music releases destined for streaming platforms.
Key features
- All-in-one normaliser, limiter, and loudness meter
- True Peak brickwall limiting with transparent algorithms
- History overview for up to 10 hours of content
- Custom alert system for out-of-range sections and True Peak overshoots
- Auto re-metering for instantaneous loudness feedback
- Presets for streaming and broadcasting platforms, including Dolby Atmos 7.1.2
- Resizable interface with compact read-out view
Best for
Best for mixing and mastering engineers who need to deliver content to loudness standards for streaming or broadcast, especially in surround formats up to Dolby Atmos 7.1.2. It is also ideal for long-form audio like podcasts or films where consistent loudness and true peak control are essential to avoid distortion downstream.