Can I access the audio output of an Android device in order to modify it before the user hears it?

The scenario is that any app or the system creates an audio output which is then routed to the speaker of the Android device. Now, I would like to get access to this audio stream before it reaches the user (of course, with the permission of said user). Is there a way to do this?

I checked out a previous topic on this as well but was wondering if things have changed in the past year with Android: How can I intercept the audio stream on an android device?

Thanks in advance