What is the 'P1' and 'P2' in the cue stack?

The P is short for Part. They have nothing to do with Follow and Hang. Think of the parts and different sections of the same cue. 

In your case the parts were used to apply different fade times to different channels.

Because the parts are sections of the same cue, you only press Go once. And also because it's one cue, each parameter can only change once overall.

Does that help?

The P is short for Part. They have nothing to do with Follow and Hang. Think of the parts and different sections of the same cue. 

In your case the parts were used to apply different fade times to different channels.

Because the parts are sections of the same cue, you only press Go once. And also because it's one cue, each parameter can only change once overall.

Does that help?