Currently using:
Studio One 5.1.1, VEP 6.5.18947, Kontakt 6.4.2. Macbook Pro 16' as primary (DAW), Windows 10 as secondary (VEP).
As you can see in the screenshots provided, the output of bus 14 gets routed to both 14 and 15. In the screenshot with the Viola, I am playing on MIDI channel 14, which is reflected correctly in Kontakt, but on VEP it is coming out of 14 and 15.
When I play the instrument in channel 15, it comes out of 16. When I play the instrument in channel 16, there is no sound (screenshots provided). This happens in every instance of VEP in which I have more than 14 channels active.
I have also found another member that uses Studio One encounter the same issue.. it looks to me like a specific issue with Studio One since users of other DAWs aren't replicating this issue.
Another Member with the same issue for Reference: https://www.vsl.co.at/community/posts/t52181findlastpost-Routing-issue-with-Vienna-Ensemble-Pro-6-and-Kontakt-with-16-channels