Signum Audio Bute Loudness Normaliser 2 Stereo — Free Download
BUTE Loudness Normaliser is a single-file desktop tool that analyzes and adjusts audio to broadcast and streaming loudness standards, preserving sonic character with transparent true-peak limiting.
Purpose
BUTE Loudness Normaliser 2 Stereo is a cross-platform application designed for final loudness compliance checks in mixing and mastering. It helps ensure audio files meet broadcast and streaming standards, preventing unwanted downstream distortion. The tool works on a single stereo WAV file at a time, making it ideal for mastering engineers and content producers who need precise, one-off normalization before delivery.
The application uses Signum Audio’s proprietary algorithms to maintain the natural characteristics of the source material during processing. Its primary goal is to prepare audio for distribution without altering the perceived dynamics or tonal balance, giving users confidence that their masters will translate consistently across playback systems.
Key Capabilities
BUTE offers an straightforward workflow: drag in a WAV file, select a preset or define custom loudness parameters, and run an analysis. The tool provides an in-depth metering readout with alerts for areas needing attention, such as true peak overshoots. After analysis, users can apply normalization in one step, with the metering graph visually confirming the extent of limiting applied.
A built-in True Peak limiter prevents inter-sample overshoots while normalizing to the chosen target level. Signum’s limiting algorithm is designed to be transparent, keeping dynamic range intact as much as possible. This ensures compliant, consistent masters without audible pumping or distortion, even on material with wide dynamics.
Workflow
The typical session begins by importing a stereo WAV file. Users choose from a range of presets tailored to common delivery specs (such as broadcast or streaming targets), or they can set custom target values using the application’s parameter system. After launching analysis, BUTE evaluates the file’s loudness and true peak, flagging trouble spots for review.
Once satisfied, the user clicks ‘Comply’ to apply normalization. The metering graph displays post-process results, allowing verification before saving the finished file. Since BUTE processes one track at a time, it suits project-based work rather than bulk processing. For batch tasks, Signum offers a separate Batch Processor product.
Practical Applications
BUTE is most useful in final mastering stages where accuracy matters. Podcast, music, and post-production engineers can use it to match loudness targets for platforms like broadcast, streaming services, or podcast directories. It is also handy for checking masters before delivery to ensure no clipping or distortion occurs downstream due to overshoots.
The tool’s transparency makes it suitable for audiophile-grade work where preserving dynamics is critical. It can be used to compare different masters against a loudness standard, or to quickly prepare a single mix for client approval. However, users needing to normalize many files at once should look to the Batch Processor instead, as BUTE is deliberately focused on one file per session.
Key features
- True Peak limiter for overshoot prevention
- Transparent limiting algorithm preserving dynamics
- Preset library and custom parameter settings
- In-depth loudness analysis with alerts
- Visual metering graph after normalization
- Cross-platform application support
Best for
BUTE Loudness Normaliser 2 Stereo is best for mastering engineers and audio professionals who need precise, single-file loudness compliance for broadcast or streaming, with minimal dynamic alteration. It is not for batch processing or multi-track sessions; for that, use Signum’s Batch Processor.
