I'm trying to setup signaling in JMRI. My layout is simple, just two tracks with a LH crossover. I think my problem is I'm not sure how signaling would work if this was the prototype. If there is a good tutorial on crossover signaling I could use it. I did read the JMRI help screen on crossover signaling. I still don't understand what I need. Do I need four signal heads or 6? The JMRI screen seems to hint at 6 but the help shows four. I'll likely want these to be real on the layout eventually but for now I'd like to get this setup with virtual signals.