I have K4 and never used it to trigger loops. I generally load the samples for....say cello, or piano, and then play those parts recording the midi data.... similar to playing and recording audio, but with synths.

I use Sonar to play K4 samples. In fact, I was playing around with it last night experimenting with viola and cello parts for something. Didn't hit the record button.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.