I've been using Dialogue Designer for a while now and mostly it's really good. However, I think there really needs to be a field on the nodes to reference audio files.
I'm at a point now in my game where I want to add recorded speech over the text, and being able to reference an audio file directly from the node would be a godsend. All it would need to be is an extra field.
Matt, please add this. I'm willing to discuss the option of paying for you to take some time to do this if necessary.
You can message me over on Twitter under the handle @herrwebster if you want to discuss it further (I don't think we can send messages through Itch).