Aria definitely works here. And it is not a DXi plugin; strictly a VSTi plugin.
When you install Aria, it will ask you where you want your plugins installed and it will install both 32-bit and 64-bit versions of the plugin.
The plugin names are:
- ARIA Player VST_x64
- ARIA Player Multi VST_x64
- ARIA Player VST_x86
- ARIA Player Multi VST_x86
In BIAB you don't want to load the Multi; that's to support multiple audio outputs, but BIAB only has one stereo output. If you have a sound card with multiple outputs with your DAW, then you may want to use the Multi version to send the output to different paths for further processing.
Only use the x64 version if you have jbridge installed; however, I don't believe that the Garritan libraries are so huge that you'll have problems using the 32-bit version with BIAB.
One thing to be careful of (and this doesn't apply to Aria)...the name of the VSTi as shown in BIAB is exactly the same whether it's the 32-bit or 64-bit plugin. Kontakt is a good example of this. For that reason, if you have the 32-bit version loaded in your list of available plugins, in order to use the 64-bit version, you have to remove the 32-bit version, then load the 64-bit version (because both are called "Kontakt".
In the case of the Aria plugin, howoever, the 32-bit is shown as x86 and the 64-bit is shown as x64; so both can be in your list at the same time (again, make sure you have jbridge for the 64-bit version).
If it's still not loading, then it makes me think it could be one of the DX/VST flag files that is causing a problem. I can't remember the exact procedure for that, but I know Kent from PGMusic has helped some folks fix this type of issue.