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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 NoNOISE 3?

NoNOISE 3 is now available for the first time as an Audio Units, VST, and AAX plug-in, and is utilized by professional engineers across a wide range of music styles, from Classical to Rock, as well as by forensic experts in law enforcement and covert surveillance. This cutting-edge software effectively eliminates unwanted noise while maintaining the original audio's quality. Functioning as a 32/64-bit single-ended, broadband de-noiser, NoNOISE 3 achieves exceptional results with few, if any, noticeable artifacts, even at high user-defined settings. Its prowess in audio restoration has garnered numerous accolades, including Grammy®, Emmy®, and Oscar® awards, and it has secured a place in the Mix Technology Hall Of Fame. With its unparalleled capabilities, NoNOISE 3 is recognized as the pinnacle of digital audio restoration solutions available today, truly raising the bar for quality and performance in the industry. As more professionals adopt this innovative tool, the potential for enhanced audio clarity and fidelity continues to expand, making it an essential asset for anyone serious about sound quality.

Media

No images available

Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

API Availability

Pricing Information

$36 per finished hour
Free Version

Pricing Information

$8.99 per month
Billed annually
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

Windows
Mac

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

chapterpass

Date Founded

2026

Company Location

Italy

Company Website

chapterpass.com

Company Facts

Organization Name

soundBlade

Company Location

United States

Company Website

sonicstudiopro.com/nonoise-3/

Categories and Features

Audio Mastering

Not specified

Categories and Features

Audio Mastering

Not specified

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