Love the way the growl introduces some tasteful saturation....

Yes... that's what I was going for.  With Pianoteq and most sample libraries - for me - the sound comes across a bit synthetic because it is so clean.  The imperfections - or some type of harmonic distortion - created by the particular wood housing, the interaction with the floor, etc, is always lacking.  I tend to add some type of saturation vst to "fatten" the sound.  I should try some impulse responses sometime or experiment with making my own to taste.  The trick is not to blur the excellent sound and character of Pianoteq but to just add that certain something.  And everyone's mileage will vary.

Also tried those same instruments as layers as well as morphed with different mix amounts - thanks for this interesting combo Cellomangler.

FYI:  52:18:48 is one percentage/ratio I was playing with.  I also turned down the impedence on the Clav to reduce its sustain.
These mixes are going to be highly subjective and vary greatly among sound systems.  This could sound appalling to someone else.