when you go into a minecart it makes it's sound, but if you pause and unpause it gets much louder

Put the summary of the bug you're having here

What I expected to happen was...: the sound wouldn't get louder

What actually happened was...:
It got much much louder after I got off the pause menu

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. get into a minecart,
3.then you activate the tracks, press the pause and it gets much louder