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!!

When morphing, 'Note Effects' this feature does seem to only work on final output stage, rather than per piano preset. (The button is in the same pane as for example 'Equalizer' which does work on a per piano basis - so perhaps this does have a plan attached to become per piano too - I guess as it's a relatively new feature set it may have more features yet to come.)

I do really like the idea of making Note Effects work per piano when morphing. The more I think about it, the more I'd use Morphing because the mixing of attacks over 2 or more instruments is a high target value setting to me. (I tend to use Layers a lot more, for this and other things which Morph does well but differently).

Not sure if that's achievable in a really short timeline? but adding my +++++ vote for such a good idea xinaes.