I’m not sure that anyone has ever had a direct response on this site from “anyone at Pianobook” since I joined.
[6 months and 4 weeks ago, using the sites bizarre date recording system].
Other than finding contact via youtube, facebook and instagrandad, you could try submitting a message instead of an instrument via contribute, I suppose. And tell them from me; it would be nice if they dropped in once in a while.
And yes, thanks for the Imperfect Piano and the Quena Flute, which both load and play in Directwave and TX16Wx.