I'm a paying annual customer and I would love to see audio note capabilities in Recall (on the web and iOS, not sure if there's a macOS desktop app yet).

A great tool to model after here is https://get.mem.ai

You can record anything on the fly, and it transcribes and summarizes it for you, and keeps the original audio file as a connected "source" inside of the note, so you can listen back to what you said (if needed).