It supports voice replies to normal posts or voice posts. It’s interoperable with Damus/kind1.
Just a suggestion — In the UI for a draft post, you can add a button for “text” or “voice” to let the user choose how they want to post/reply.
Good luck with coding it up! We use an audio player in the post now with a play button, Damus in purple will look cool.
https://gist.github.com/ColbySerpa/1fabde1f8f2a880ba1cbb8b06f5011e8