Guide

Join audio files into one MP3.

This guide covers the cloud audio-join job. The job returns one MP3. It does not change a script.

Create an account. A free account includes five cloud outputs, once. No card is required.
Open Audio Join. Starter is $20 a month for 500 cloud outputs.
Add 2 to 20 audio files you may change. Put them in the order you want.
A trial file can be up to 250 MB. A trial account also stops at 20 uploads or 1 GB in total. A paid source file can be up to 2 GB.
Run the job. One join uses one cloud output. The result is one MP3.
Download the result within 24 hours. A failed job returns its quota.

Limits

Twenty files at the 250 MB trial limit do not fit in the 1 GB trial total. Use smaller files, or use a paid plan.

This page does not state a sample rate or a channel count. The audio stream check reads those fields from one file. It does not join files.

A new file does not guarantee reach, approval, or a lower ad cost.