When you drag a CHOP channel onto a parameter field, you can auto-populate the field with a Python expression that will look something like op(‘null1’)[‘chan1’], referencing that specific channel by name.
I almost always immediately change that expression manually to op(‘null1’)[0] to reference the channel by index instead, as I might plug a different input into the Null later, and if the channels don’t have the same name the reference by name will break, but the reference by index will still work.
If there was an option to make those automatic references use the index of the channel you drag into the field instead of the name, that would save me a ton of time and typing!