Dorico’s playback is misinterpreting semiquavers as longer than dotted quaver.
Tempo is crochet=106.
That is not what appears to be happening, and we cannot hear an illustration.
Are you sure your sound set is not blending the semiquaver (sixteenth note) into the dotted quaver (eighth note) that follows such that they sound like one note? I know that can happen with strings if they have a “soft entry.” Perhaps this trumpet sound is behaving in like fashion.
You could try to use the Played Durations Tool (the little icon of a sound wave to the left of the dual quaver icon) to shorten the playing time of the semiquaver without shortening its duration, or you could lower the velocity of the semiquaver to see if you can then hear the separation with the note following.
I don’t understand.
you can clearly see the first image a semiquaver is selected, and the logic operator chose it as between medium and long.
Second image, dotted quaver is selected and is interpreted by the logic as between short and medium.
There are all sorts of problems with the audiation, but to begin with I’m trying to debug at least the way Dorico interperets rhythm. This doesn’t happen on the french horn , playing in rhythmic unison.
I set up conditional length controls via the expression map to test it. Manually shortening the notes is not my goal. 
I confess I misread your diagram. In the future consider highlighting the section that shows the problem if you can. Paint can put a colored frame /box around a part of your image to help the inattentive such as myself.
I confess, I have no expertise in the problem you are investigating, but there are those much wiser than I in this area who will doubtless chime in here soon enough.
I would check out the logic in your expression map - have you perhaps missed a natural<=short entry (or similar)?
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I’m happy to look into problems like this, but only if you provide a minimal project. I don’t have time to try to set up identical situations in test projects, unfortunately. So if you need our assistance, please create a simple project with a single instrument and the smallest number of notes (and tempo marks or whatever else might be needed) required to reproduce the problem.
apologies, here is the link to the problem file:
And the expression maps for brass and strings:
Could you please prepare a minimal file? Just one instrument with one bar of music would be ideal. Thanks!
As I suspected, your expression map has NO BASE SWITCH that will trigger on a SHORT!
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Where can I find a tutorial for base switches? this library isn’t separated to shorts and longs. there’s just one patch and it just plays. Embertone does have shorts, but Samplemodeling (brass) does not. Only release time knob and velocity for attack speed.
Simpllified file:
Edit, both horn and trumpet have the same problem. Long notes are recognized as shorter than the short ones.
Looks like you are ORing some conditions which should be ANDed. Check if the correct logic buttons (“All of”, “Any of”) are selected. In your image, the 16th note satisfies Note Length <= Long.
(Classic movie!)
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Right, the or/and did the trick. thanks!
Another related matter - in these measures the long notes are classified as long<VALUE<very long.
Even if I set the “length” parameter at 1%, the long note is still too long. Too long even for the natural decay of the release time (of samplemodeling instruments).
What am I doing wrong?
For long notes, I believe the Length % parameter shortens by a quarter note at most. See this thread:
In the Key Editor, clicking the Played Durations button shows the effect of Length %.
I don’t have your virtual instrument set up, so I’m not sure how it’s interacting.