Barry-
Are you using a 32-bit or 64-bit version of Studio One? Make absolutely sure that the path that Studio One is looking for UltraChannel in is the corresponding 32-bit or 64-bit version, and that you installed the correct 32-bit or 64-bit VST in that location.
I usually find that following the steps below sorts out these types of issues, if what I mentioned above all checks out:
1. Close your DAW and delete the following files:
-AAX32: c:Program Files (x86)Common FilesAvidAudioPlug-InsEventide<plugin name>.aaxplugin
-AAX64: c:Program FilesCommon FilesAvidAudioPlug-InsEventide<plugin name>.aaxplugin
-VST32: c:Program Files (x86)Common FilesSteinbergVST2Eventide<plugin name>.dll
-VST64: c:Program FilesCommon FilesSteinbergVST2Eventide<plugin name>.dll
-Presets: c:Users<user name>My DocumentsEventide<plugin name>Presets
2. Open your DAW and rescan you plug-ins, and then shut your DAW again.
3. Reinstall UltraChannel, making sure you are using the latest version: https://www.eventideaudio.com/products/plugins
If you are installing to a custom folder, make absolutely sure you are installing the correct 32 or 64-bit version.
6. Reopen your DAW, and if necessary, rescan your plug-ins.
Let me know if you still have issues.
-Tom
