KEP is confused...

The pulsars we know from radio astronomy which we expect to emit gravitational waves, too, are (mostly) too far away for the current sensitivity of the detectors, if our ideas and models of gravitational waves and their sources are right. So what we currently do is to "blindly" (i.e. untargeted) search the whole sky for closer, pulsar-like sources of gravitational waves, that may not show up as electromagnetic pulsars.

You can indeed express the sensitivity of the detectors in terms of distance we are able to search. I don't remember the numbers (e.g. distances) from the top of my head, but if you want them, you maybe better asking over in the science board.

And I'm not sure I understand your final question. For what it's worth, we are searching all the data for all (reasonable) frequencies. The main idea for splitting the work into the workunits is the frequency, so a single Task only searches a rather small frequency range in all the data (from one detector).

BM