Add sound to Send button

Hey, oxygenimagery, I am another CF7 user.

You can achieve this using DOM events and JavaScript:
https://contactform7.com/dom-events/

Here’s some JavaScript that you can use as your template:

let audioClip = new Audio('audio.mp3');
audio.play();

https://developer.mozilla.org/en-US/docs/Web/API/HTMLAudioElement/Audio