Typically in Jazz and Broadway when changing instruments changes of key or clef always occur right at the entrance of the new instrument. This is beneficial as the new key sig is an additional alert to the performer that something is different in case they spaced out and missed the “to” indication earlier. Unfortunately Dorico places the change as soon as the previous instrument stops playing so there isn’t a good option to control this placement. There really should be an option for this “late” change in Layout Options/Players/Instrument Changes or Engraving Options/Instrument Changes.
I had been using a pretty convoluted workaround to accomplish this, and was posting in response to another user on the Dorico FB thread, when Ryan Ayers proposed a pretty neat solution to this, and it works! Basically if you use an independent key signature in the instrument you are changing to in order to make the key signatures match with the current instrument, then Dorico won’t draw the key signature when it makes the “early” change. You can then correct the independent key signature at the actual entrance.
Here’s an example. If I have this transposed score in Galley, where one player is holding both Alto Sax and Flute, and the key sigs match using independent key sigs …
… then I end up with this in the part:
It appears as a “late” instrument change and everything plays back correctly too! Perhaps I missed it, but I hadn’t seen anyone else come up with that here so thought I’d share. Here’s a file too in case any of that isn’t clear.
Instrument Change.dorico (627.7 KB)