I think we explained this over a year ago: Dorico and VEPro Port 2 and beyond
As has been mentioned several times over the years, there is currently a limitation to the number of stereo feeds to the Dorico mixer from a single VEPro instance. This is set to 16 for 16 midi channels. You can easily have Port 1, channels 1 to 16 coming into the Dorico mixer on 16 different stereo channels, but once you use more than one port in a VEPro instance, the outputs will start overlapping and will therefore not work: If you have say an instrument on Port 1 midi channel 1 you will hear that in Dorico, no problem. If you then have another instrument in the same VEPro instance on Port 2, midi channel 1, it will not come into the Dorico mixer as a separate channel, and you will not hear anything because midi channel 1 is already assigned to Port 1. If you un-assign your Port 1 instrument, you will hear your Port 2 instrument.
It is therefore recommended to use 16 channels per instance, all on Port 1 to get 16 channels in the Dorico mixer.
If, however, you assign all your instruments in VEPro to the Stereo bus, they will come into the Dorico mixer on one stereo fader, and you can use as many Ports in a VEPro instance as you want.
I don’t know what it will take for this limitation to change or expand, but it has always been like this thus far.
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