For Fb2k i see, in task manager, a costant value of 6 for page faults delta with rare pick to 7 or 8.
Do it is normal?
What does this mean?
Perhaps it is simply the data of music from time to time loaded into memory?
Page fault delta is a fairly accurate indicator of activity for any program (moreso than CPU time). 6 is very low. My foobar is about 20 during playback, 600 on starting. To give an idea, Firefox is a couple thousand on doing whatever. Don't worry about this number. It's completely normal.
More here: http://en.wikipedia.org/wiki/Page_fault (http://en.wikipedia.org/wiki/Page_fault)