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What is chapterpass?

Audible's ACX has established eight technical standards that must be met, with any file that does not satisfy even one of these standards being rejected without exception. Chapterpass takes great care in preparing each chapter file to meet these requirements, ensuring that the RMS loudness falls between -23 and -18 dBFS, peak levels remain below -3 dBFS, the noise floor is kept under -60 dBFS RMS, and room tone is included at both the start and finish, all while producing a 192 kbps CBR MP3 file. Every audio file undergoes a thorough review to verify compliance with all specifications before it becomes available for download, allowing users to view precise measurements for each requirement at all checkpoints. The entire processing occurs in the user's browser through the use of WebAssembly technology, which ensures that audio files are kept on the user's device throughout the operation. Users can utilize the service without the need for an account; the first file is offered free of charge, while subsequent files incur fees of $36 per finished hour, $27 for five hours or more, and $18 for ten hours or more, all billed by the second. Furthermore, a complimentary measurement tool is available at /free-acx-check, enabling users to assess loudness, peak levels, noise floor, and silence padding in relation to the specifications without performing any mastering. Although Chapterpass specializes in mastering the essential technical standards, it does not engage in editing, noise removal, or any corrections to narration, thereby ensuring a smooth and efficient process for creators seeking to meet ACX requirements. This commitment to quality and compliance allows creators to focus on their content while trusting that their audio will meet industry standards.

What is Signum Audio BUTE Loudness Suite?

Loudness metering tools are exceptional at maintaining an ideal equilibrium among music, dialogue, and sound effects, supporting both stereo formats and Atmos 7.1.2 surround sound configurations. The incorporation of a smart history overview feature greatly simplifies the management of long-form content. Users can easily traverse through up to 10 hours of audio using an interactive display, providing convenient access to any segment of a track. BUTE's custom alert system effectively identifies areas that exceed user-defined limits, including True Peak overshoots, thereby improving the ability to uphold audio integrity. A selection of industry-standard presets is available to allow for swift modifications. When screen space and CPU resources are at a premium, a compact read-out offers effective performance while conserving resources. Additionally, the resizable design of BUTE gives users the flexibility to adapt its layout to their workspace. Even in its minimized view, users can effortlessly toggle between different display modes and tweak limiting settings, ensuring efficient use of space for other applications. For an enhanced auditory experience, users can adjust peaks by altering pre-gain settings and choosing from preset release curves—Transparent, Natural, or Smooth—each designed to effectively reduce the audibility of gain reduction. This extensive range of settings and configurations underscores its significance as an essential resource for audio professionals, making it a versatile addition to any sound engineer's toolkit. Overall, the combination of user-friendly features and advanced functionality positions these tools as indispensable for achieving high-quality audio production.

Media

No images available

Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

Has API

API Availability

Has API

Pricing Information

$36 per finished hour
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

chapterpass

Date Founded

2026

Company Location

Italy

Company Website

chapterpass.com

Company Facts

Organization Name

Signum Audio

Company Location

Scotland

Company Website

www.signumaudio.com/bute-loudness-suite

Categories and Features

Categories and Features

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