Answer to question how to change first variable in a list is easy to answer :
put $1 at the beginning of the list and connect whatever you want to set that value.
I think you need first to learn how to use line itself.
Go to help file and check difference between list
containing comma separated start, destination and ramp time
or list with destination - ramp time pair(s)
What is that DRY/WET dial supposed to do ?
Set start point for the ramp ?
Or set and trigger the ramp ?
And how do you want to prevent it to trigger ramp all the time,
whenever you move it and before wished list like
0.3, 1. 5000 is set and fired ?