On bass notes, one or more partials above the 1st rings longer?

Many of the higher frequencies produced by a piano's bass strings are not the result of the string itself, but instead are produced by the copper wire coil wrapped around the string (which is done to add weight to the string so that it can be tuned to a lower frequency without being too lax (loose) or without having to be too long (longer than is practical in a piano cabinet/frame). This is (at least one reason) why the harmonics and other higher frequencies are often heard to a greater extent than the fundamental tone of a bass piano string.

Perhaps a piano technician or tuner can add more technical information to this discussion.

The decay  of each partial of each string (all notes, not only the bass notes) is a matter of soundboard impedance, which varies with the frequency fore each note. The resonance modes of the soundboard plus strings system are independent, each partial can have a more or less pronounced decay. It is common to have the fundamental decreasing faster than some of the higher partials, particularly in the bass range.

A fast decay is usually associated to a strong sound, because fast decay means rapid energy transfer to the soundboard, hence a louder sound. On the contrary, low decay means slow energy transfer and a less loud sound. The interesting thing that can happen and that you noticed is for example a fundamental with fast decay and say a third (or any other range) partial with slow decay. In such a case, the fundamental will be louder at the beginning of the note, but as it vanishes rapidly, the third overtone will slowly get more audible and at the end you won't hear the fundamental any more, only this third (or any other range) partial.

Would it be valuable to implement this phenomenon in the model? We can control the impedance and for that matter the amplitude of each partial, but the decay rate of partials is outside our reach. I'm not sure what changes would have to be made, either within the internal model or the part of the model that is accessible to users of the pro version. Tying the decay rate to the partial amplitude, so that increasing the amplitude of any partial automatically reduced its life? But that would be controlling the soundboard impedance through the partial structure, instead of controlling the evolving partial structure through the sound board impedance.

In any case, I hope I am not dwelling on a small aspect of the sound. It seems possible that this aspect of the sound might instead contribute to the "realistic" evolution of the decay. It may contribute to what many people hear as the life in a note. On the other hand, I can see that it might be complex to implement--how would it interact with the detuned unisons, with the current Impedance control, etc?

My worry was that I was not hearing changes in the Impedance changing the decay of specific partials, or more specifically causing the fundamental to die before other partials. I'll have to go back and listen. I was thinking that the Impedance affected all of the partials equally, with the upper partials always dying away earlier.