The best sounds from all of our legacy sample libraries are included in Omnisphere's factory library as Soundsources. 

In fact, many Omnisphere Patches use those Soundsources and build on their sonic legacy. 

If you'd like to use sounds from Spectrasonics legacy sample libraries in their original, "raw" state, you can do so via Omnisphere's Soundsource Browser. 

To find Soundsources specific to a particular legacy library, simply search the related library below:

You can also search using the same tags in Omnisphere's Patch Browser, which will display Patches that use Soundsources from that specific legacy library.