FumeFx Script Properties Questions

[Galagast]

I'm probably having a very cloudy day in head because I can't seem to find these maxscript properties from the fume UI:

Code:

-- using this command on a selected fumefx node
show $

Code:

PreviewStart
PreviewEnd
PrevewNth
PreviewFPS

I tried to get and set thier values, but I didn't notice any change.