I do not use the Duo but from looking at their chart I would suggest the one of the following.
Red Warm: Quin red, Naphthol Red or Cad. Red Med (from the elite),
Cool Red: Alizarin Crimson or Anthraquinone Red
Cool Blue: Ultramarine Blue Deep (elite) or Phthalo Blue
Warm Blue: Indanthanene Blue
Cool Yellow: Lemon yellow or Cad. Yellow lemon (elite)
Warm Yellow: Imidazolone Yellow or Cad Yellow (elite)