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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 Elevate?

Elevate is an advanced mastering plugin that combines a multi-band limiter, an EQ designed for the human ear, and an audio maximizer, all aimed at increasing the loudness of your mix while preserving or enhancing its dynamic range. The plugin utilizes intelligent, adaptive algorithms that respond in real-time to the music, ensuring not only increased loudness but also outstanding audio quality. Its adaptive limiter assesses 26 distinct frequency bands, making rapid adjustments to gain, speed, and transients for each band, leading to a clear and natural output regardless of the gain level applied. The EQ is meticulously engineered based on human auditory perception, featuring 26 essential filter bands that are strategically spaced for optimal control over sound interaction with the listener's ear. This thoughtful architecture allows for precise tweaks to the transient attacks of individual instruments, such as kick or snare drums, which enhances their clarity and prominence within the mix. Additionally, the plugin boasts a spectral clipper that enables users to push the final output to the edge without losing tonal balance or introducing unwanted artifacts, solidifying its status as an indispensable asset for mastering engineers. With its innovative features and user-centric design, Elevate truly redefines the benchmarks of audio mastering technology.

Media

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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

$79 one-time payment
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

Windows
Mac

Customer Service / Support

Web-Based Support

Customer Service / 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

Newfangled Audio

Company Website

www.newfangledaudio.com/elevate

Categories and Features

Audio Mastering

Not specified

Categories and Features

Audio Mastering

Not specified

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