I can't select MP3 tracks by using "rating"

[simoncn]

I am using the JRiver approach as it is the simplest and should AFAIK be compatible with how other popular tagging programs map POPM values to "whole" stars:

POPM 1-51 -> RATING 1
POPM 52-102 -> RATING 2
POPM 103-153 -> RATING 3
POPM 154-204 -> RATING 4
POPM 205-255 -> RATING 5

I don't plan to make this configurable as I think this would add too much complexity.