[NTG-context] How to control spacing around titles?

Hello, how do I influence the space around titles (i.e heads, in ConTeXt-speak)? What I want to do: 1 Chapter title text in paragraph 1. 1.1 Section title text in paragraph 2. 1.2 Section title ...and so on. I figure it has to do with setuphead[chapter][-insert magic here-] but I was not able to find something in the wiki nor in the list. Oh, and direkt control (cm or pt) instead of small/medium/big would be great. Christian