Summary:
The position of your head in relation to the audio sources completely changes the volume emitted, according to your position
Steps to Reproduce:

1. Elytra: Flying upwards, the sound is low, but looking downwards, it is loud and cut off
2. Food: Looking upwards, the sound is low, but looking downwards, the sound is loud
3. Jukebox: With your back to the jukebox, the sound is low, but facing it, the sound becomes very loud

Observed Results: 
I noticed that head rotation can greatly affect the way you hear the sounds in the game. I noticed that there is a similarity in all the videos. When you turn towards the sound source, it increases drastically, but when you look in the final direction, the sound becomes extremely quiet, even though your distance from the sound source is almost zero.
Expected Results:
These audios should change due to the position of your avatar's head, but not as drastically as in the game
Screenshots/Videos Attached: Yes