I have never used Pyro before. I mainly use Xtol with T-MAX and HP5
and HC110 with TRI-X. I would be interested in using Pyro for the first
time. My method of developing 4x5 negatives is thet tray method.

In a short search I notice that there are different types of Pyro Developer
and got pretty confused about what type of Pyro to use with what film
and whether its appropriate for the developing method I am using.

Help demystifying this issue.

Thanks in advance.