For anyone interested, one of the guys on here found a tool that you can use your keyboard to hit a key and play stadium sounds in the background but doesn't break the immersion and feels great.
I will be doing a video tutorial soon showing how to set it up. Super easy, super simple. You control the sound.
Here is a great ROCKY TOP preview to show how awesome it actually is.
** NO, AUDIO MODDING IS NOT POSSIBLE, THIS IS PLAYED IN THE BACKGROUND BUT THE TOOL ALLOWS YOU TO PLAY DIFF STADIUM SOUNDS AND FADE THEM AS DESIRED **