I completely understand! However, as much as recordings are useful, it's important to remember it doesn't mimic a real interview as you won't ever just be speaking on end unless you are giving a presentation. Even then, it's likely your interviewer will ask follow up questions and pick up on things you mention.
I think my biggest advice and the thing that helped me in interviews was to mentally pace myself as I have a tendency to waffle and speak very fast when I get nervous. When you are asked a question, don't feel like you must respond at the very next second.
To help pass this time ( because of course you can't just sit staring at them ) you can start your answers by saying something like: I think I am interested in X firm for 2 key reasons. My first is xyz .... This will help you feel and look more in control as it gives you time to gather your thoughts.
Don't worry too much for now about sounding conversational as you can't really pre-empt this, it depends if your interviewer is also conversational!
So my take-away is to practice being controlled and measured.
I'm sure everything will be fine- best of luck