Thank you fratveno for solving this.
I did have a base switch called sul pont+trem but it was set up wrong. I had simply labelled a switch sul pont + tremolo and had fiddled with keyswitch and channel settings . What I had forgotten was that we can select multiple playback techniques and that this would create a condition where Dorico sees that the sul pont playback technique and the tremolo playback technique occur together. When it does, it knows to activate the specific channel and keyswitch I’ve specified.
Your comment caused me to re-read the manual on “Adding/Editing switches in expression maps.” The Tip at the bottom mentions the multiple selection of playback techniques. I shift-clicked the sul pont and tremolo techniques and created a “proper” base switch. It worked perfectly. Thank you!
I have the complete OT Berlin Strings library (on Sine). Separate instruments on separate channels are needed to access all the articulations. For example, for the violins 1, I’ve assigned the main library to midi channel 11 and the Special Bows 1 library to midi channel 1. I’d like to use the “sul ponticello tremolo” samples from the Special Bows library.
I’ve set up a playing technique/expression map entry with an absolute channel that will change the midi channel to 1 and select the sul ponticello tremolo. And there is no problem… until I add a visual tremolo marking (Shift-R ///) and then it doesn’t work: the built-in tremolo playing technique apparently overrides the custom expression map. I can’t figure out how to work around this except by creating a visual-only tremolo music symbol that doesn’t play anything.
Is there another solution? I think I’ve studied the manual and relevant videos carefully but if I’ve missed some concept or solution, please let me know.