Yellow & brown, but it does not look like O. sphacelatum. The yellow & brown "motif" is pretty common in Oncidinae - this could be a different species, or a hybrid.
O. sphacelatum is not known for being strongly fragrant, but does have a very faint scent; the faint scent is characterized by zingerone (the chemical that lends pungency to ginger), so if you are detecting that spicyness, maybe O. sphacelatum is "in the mix" somewhere in the genetics.