See everything at a glance
Lay files side by side and compare their waveforms and loudness. Spot an outlier or an uneven level without opening each file.
Windows / macOS / Linux
a9a
Get your audio assets into shape, in bulk. Built in Rust.
a9a gets your audio assets, from sound effects to voice and music, ready to use. Compare files by waveform and loudness, adjust gain, loudness, fades, and loop points, and export to the format you need. The same processing runs in the GUI and the CLI, so it carries from checking a single file to bulk runs and automation.
Documentation
Key Features
Core capabilities
Loudness and gain
Match loudness to a target and adjust gain. The volume differences between assets go away, so everything plays back at a consistent level.
Fade in and out
Set fades with a choice of curves. It smooths the start and end, avoiding clicks and abrupt cut-offs.
Loop points
Set the loop start and end points, so background music and ambience repeat seamlessly.
Requirements
System requirements
Supported OS
Windows 11
macOS Monterey or later
Linux glibc 2.34 or later (x86_64 / aarch64)
On Linux, only the CLI is available.
Screenshots
Main window
The main GUI window for checking, adjusting, and exporting audio files.