I don't know... this test is unscientific... clearly mud and banana can have an unintended side effect that makes audio sound better and needs to be investigated immediately.

on a more serious note.. doesn't seem like the "good" audio was good? there is a huge difference between noise free audio and garbage integrated audio / speakers with hizz imbalance and peaking... if the "good" audio is bad then there obviously won't be a difference between any of them.

which makes me think... banana and mud are noise filters... hmm...