Hi Jasen,
no, afaik time stretching is not made for only one Key on the Keyboard, but for all. If not, please tell me how you can use this only for one Key on the Keyboard.
here are a few examples ...
(all examples refer to Repitition 1 in the Vienna Inst. PRO Player).
1. Percussive Violin: For this check Dimension Violins / Player 1 - articulation SustainVi and Key A2 (and/or a half tone below) on the Keyboard. There's a too loud Start-Klick which does not fit in the context cause it is too loud. With an Editor I would cut it (but only on G#2 and A2)
2. Sounds which do not fit in the context: For this you can check Dimension Trumpets Preset 11PTr P1 Compact pro / articulation SustainVi and play C#2 and D2 and then E2 and F2 ... you will hear the differences in loudness. Here I would like to exchange the 2 soft tones with an Editor.
3. Sounds which are not in tune: this seems to be a Brass problem.
... test Flugelhorn and/or solo trumpet Bb ... and play:
a) Flugelhorn: articulation SustainVi ... play F3 on the Keyboard and you will hear that the tone does not start with an F, but a halftone below (sounds like Legato). Same with FortePiano C#3 and D3.
b) Trumpet Bb: Same issue like a) ... articulsations FortePiano or SFFZ ... play tones E3 and F3
4.) Or as mentioned Recorders Alto ... G#2 and A2 ... but that was already a topic in another tread and was confirmed by other users.
I hope that helps to understand. But the focus on this thread is to find good solutions and 2 have good ideas. So let's not dicuss too much like in the "insurance thread".
BR Lars