Hi Jon S, thank you - so glad you enjoy it!
IIRC, the demo was not my music but from the Minnesota International Piano e-Competition (posted this Wikipedia link, as the main website link is at the bottom of the wiki page - it didn't load well for me, otherwise I would have linked to it directly).
I thought it went well with that sound - and still love the delicately emotional vulnerability expressed within the performance by Yinfei Wang (Scarlatti - Sonata in B minor - K. 87). I believe with each update, demos are also updated to reflect the piano/presets but I have not any role in that process.
I like how Pianoteq has some quite 'expected' preset types and 'unexpected' alike - and appreciate how versatile it can be. Great product allowing any kind of pianist of any level to really hone their own vision imho. Most of the music I make using Pianoteq is studio driven so as much as I like this preset by itself in stand-alone mode, I often go further (magnifying/mixing etc.) in my music - and these kinds of presets exceed - imparting things I like at least.
About playing Gentle presets gently to make good use of this kind of preset, I think it's just a mode really, or mindset to get into, explore etc. if unfamiliar. It's a pretty forgiving preset and can be played fairly normally - but at least to me, its qualities are best revealed in lower velo ranges.
I'd offer a goal of seeking to 'tend to range' most key strikes below 'midway-ish' (keeping a peeper on the 'velocity pane' on the main interface.. you'll see how along the bottom it lists MIDI velocity from 0 to 127.. it's up to every person, the piece, the goal etc.. but I feel the tones in this preset can work wonderfully when you see more 'mp' than 'mf' for example.. and for sure, that's not to say never a louder strike to be made.. but, generally the 'glue' for my tastes is when I'm seeing velocities under and around half way.. with emphasis/harmony etc. not much more than 75-ish - every piece/taste will differ on what's preferred though - and I've enjoyed some extremely gentler playing than that.. and some higher velo too.. the confluence of many factors seems where reality sits for any individual's pleasure.)
Pianoteq allows not only a good results with one piano sound (or a sub-selection of the few which come with any dpiano) but also quite a bustling library of absolutely terrific instruments, from times past to present day instruments. And to think, this can continue along into the future - really pleasing.. and for sure, Gentle in this piano, or even the guitar, are simply a kind of variant (not an exacting thing per instrument, a generalization really) which hopefully inspires others to find their own versions and visions for their own music - and get into the fabulous craft of producing their own hand-hewn piano sounds to make wonderful music, from classical to the modern
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors