"it doesn't look as nice as the original version ... May be because of the dark background of the VU meters."
That's why I told that this combination will not look nice. It will be hard for me to make the background less dark.
"the left LED string doesn't seem to show the correct audio level."
Notice that the led's in foobar have faster time of light up and light off than the analog. Believe me I set them up correctly.