MP3 export uses @breezystack/lamejs 1.2.7 by Alex Zhukov and contributors.
License: GNU Lesser General Public License version 3 (LGPL-3.0).
Upstream notice: /vendor/lamejs/LICENSE
License texts: /vendor/lamejs/LGPL-3.0.txt and /vendor/lamejs/GPL-3.0.txt
Upstream project and corresponding source: https://github.com/shijinyu/lamejs
LAME project: https://lame.sourceforge.net/
Source revision: 1fb0ef5fa177413107e2e107d054a9b994e3f79c
Release package: https://registry.npmjs.org/@breezystack/lamejs/-/lamejs-1.2.7.tgz

The encoder distribution is unmodified and loaded separately by audio-export-worker.js.
To replace it with a compatible version, replace /vendor/lamejs/dist/lamejs.iife.js.
The replacement must expose lamejs.Mp3Encoder with encodeBuffer and flush methods.
The source archive for this distribution is supplied at /vendor/lamejs/source.tar.gz.