VSL Special Edition, Vienna Ensemble (standard), Trying To Find VST Reverbs In Sonar X1

Sonitus Reverb is included with Sonar, but I believe it and others are all DX and not VST.  However, if you have CSR reverb, it is a VST and should be available, depending on where you installed it.  Don't forget, you have to tell Sonar what paths you have used to install all your VST's - go to Edit/Preferences and locate VST Settings.  Click the Add button to add the location(s) where your VST's are and rescan.

What are the bitness of your Sonar and VSL? I don't think VSL includes a 'bitbridge' of any sort, so if you're using 64-bit VSL and you installed the 32-bit VST plugins then you won't be able to access them. And verse-vica.

All the Sonitus plugs included in SONAR are 32/64bit VST (depending on which version of SONAR you install).

There is also a 32bit version of Perfect Space an IR reverb, a lite version of Voxengo Pristine Space.

I use Vienna Ensemble Pro, but I'm not sure how different it is from the "standard" version. But Sonar 64-bit doesn't actually come with any 64-bit VST reverb plugins. As was pointed out, the Sonitus suite that comes with Sonar is 64-bit DX. Perfect Space is 32-bit VST, and studioverb is a DX as well as being 32-bit. So if you run 64-bit Vienna Ensemble, you won't see any of those.

CSR is 32-bit as well, I don't think they ever did a 64 bit version.

JBridge is probably your best bet, but I'm not sure how well it works with VEnsemble. By reputation, JBridge works very well, give it a shot.

Your other option is getting a true 64-bit reverb. Valhalla Room is an excellent one for $50. Vienna MIR 24 is around $545 and you get Vienna Ensemble Pro as well, so it might be worth it to you. Or go whole hog and get the full Vienna MIR.

With only 8 gigs of ram, the full Vienna MIR Pro would not be a good option, as a whole lot more ram would be needed, along with at least an i7 9xx series (and really something better than that).

MIR Pro 24, OTOH, would likely at least function with the 8 gigs of ram, and with just the VSL SE libraries might be ok, as VSL SE is nowhere near as demanding as the full VSL libraries.

Another couple of options (though I use the older MIR SE stand-alone, so have not played with the following options):

Vienna Ensemble Pro 5 would allow you to connect to the VSL SE instruments in either 64 bit or 32 bit mode IIRC as I think it has both 64 bit and 32 bit server modes.  You can use it on the host machine, it does not have to be used with just slaves connected to the host.

Also, the new Vienna Instruments Pro 2 includes a basic reverb one can use.  VI Pro 2 is far more flexible than the standard VI, particularly the time stretching function that allows you to create all sorts of alternate articulations.  Particularly using the SE libraries, the ability to create a fast legato could be important, as well as longer or shorter detaches in strings, different lenght short notes, etc.

Finally, another option, though also not inexpensive, but far less ram/CPU intensive than MIR Pro/MIR 24, would be the Vienna Suite of plugins.  It now includes both a convolution reverb as well as a hybrid reverb, along with several other effects.  As it is designed especially for use with the VSL libraries, it might be well worth looking into.  It also includes many different presets in the various effects for the VSL instruments.