Hello Jeffrey!
We have made an extensive Sibelius Integration tutorial that should be able to help you. That's the best place to start.
https://www.vsl.info/en/tutorials/guides/sibelius-integration/introduction
It can have different reasons why articulation changes don't work as expected or instruments play on the wrong channel. Did you go through the Troubleshooting section of the "Sibelius Integration" tutorial yet? All possible reasons that come to my mind are listed there.
https://www.vsl.info/tutorials/guides/sibelius-integration/troubleshooting
If you can't find a solution there, please send the following screenshots to with a reference to this thread.
- Sibelius "Add or Remove Instruments" menu
- Sibelius mixer
- Sibelius Playback Devices menu
- Sibelius Manual Sound Sets page of all loaded devices
- Vienna Ensemble showing one of the instruments that doesn't work correctly
Best regards,
Andi