It is for three pianos—three simultaneous instances of the Una Corda library, using each of the three instrument "types" (Felt, Cotton, and Pure, albeit not in that order). And while I see where you're coming from with regards to the "cloth over the strings" samples, that is in fact the precise sound I was going for. It's hard to describe, but I outlined my stylistic motivations in my submission email as something a good deal more subdued in mood than the original, and I felt that the Una Corda library, with the incorporation of fabric into the instrument, suited that mood well.
Your feedback, however, is well-received and will be duly considered when trying to make the most of the Una Corda library in future endeavors. Thank you