First item in list of dynamic var?

Hi!

Is there a way to select just the first item from a list, specifically using dynamic vars? For instance if I'd like to have supervibe just play the root note in this example:

setI "chords" ("[0,2,4]")

d1 $ s "supervibe*4" # n (scale "ionian" ("^chords") )

EDIT:
mono worked for getting the first item in the list:

d1 $ s "supervibe*4" # n (mono $ scale "ionian" ("^chords") )