I had used the Auto Duck effect without any issues in Audacity version 3, but after migrating to the new version 4.0.0, the function has disappeared from the Effects > Volume and Compression menu. I am using the Spanish version. Any idea what might be going on? I already know how to use it, so that isn’t the reason.
That functionality hasn’t been implemented yet and may get added to a future version of audacity 4. In the meantime, I have added it to my web port of audacity 4: Soundscaper