Wonderful - this blue 'Freeze' button inside the Morph pane is very easy to use with pre-selected obvious things.
Not sure when it was introduced - but I missed this (or had forgotten).
Thank you xinaes! - this furnishes a quite substantial benefit to morphing.
For some details (like this unfrozen control) I can't yet get a fix on though..
The morph process seems still, to be very touchy near 50/50 balances (probably understandable given the unfrozen element)..
just less than 1% and the morph is either nearly completely 'with or without' pleasing mid-points between the hammered piano and the 'bowed' one. For example, one piano with hammers normal, one with long note edit envelope. At 50/50 mix (even with 2x smoothing, which uses 2 instances of Pianoteq's engine), I will hear the hammered piano very clearly and find the bowed one pretty un-obvious in the mix. But, even adjusting the hammered piano down by 1/2 a percent, suddenly the entire sound is lacking hammers.
That's why I never really thought to use this in morphing - it seems just a little improved and I hope it's possible for more widened variants to become possible with the FX and other things (which are I thought all just frozen but not un-freezable).
Although I still pref Layers over Morph due to that kind of less incremental certainty - it's a great thing to learn today - again thanks!!
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors