Minecart movement sound volume is controlled by the "Friendly Creature" volume slider.
What I expected to happen was...:
Minecart movement sound volume would be controlled by a slider that more accurately categorizes the source sound, like "Blocks" maybe.
What actually happened was...:
The volume slider labeled "Friendly Creature" adjusts the volume of the sounds the minecart makes while in motion.
Steps to Reproduce:
Enter the game's options menu.
Ensure the "Master Volume" & "Friendly Creatures" volume sliders are set to audible levels (e.g. 100%)
Enter a minecart and set it into motion on a track, you should hear minecart movement sounds
Enter the pause menu and navigate to "Options" > "Music & Sounds"
Adjust only the "Friendly Creatures" volume slider to 0%
Exit the pause menu
Ride the minecart again and hear no minecart sound
Related issues
Comments

This is a duplicate of MC-42132
Relates to MC-42132
That last bit is MC-168621