Working on the Native Tremulants, I found this delicate and soft registration for this lovely small piece (which I really like)
Echo/Récit: Bourdon 8, Trem Echo
Pos.: Flûte 4, Prestant 4, Trem Pos
Ped.: Subbass 16
Due to the fact, that engaging the native tremulant results in slightly different detunings of Flûte 4 and Prestant 4 pipes, we have an additional "Unda maris"-like effect.