Keep your ears open
Creative Commons Attribution-ShareAlike 3.0 license, not suitable for the FreePats project. Furthermore, their web site lists an additional condition: they must not be sold or made available 'as is' (i.e. as samples or as a sampler instrument). This condition alone makes the sample library non-free as imposes restrictions on distribution of the samples, and apparently it also forbids to create independent sample libraries with them, which is what the FreePats project wants to do.
It is licensed under Creative Commons Sampling Plus 1.0 license, which is not a free license. Moreover, it uses samples from other sources like Philharmonia Orchestra, which are incompatible with the Sampling Plus license, so the legal status of the whole library is uncertain.
While it is labeled as "public domain", the included LICENSE file contradicts it. In particular, it says that "contains samples that could be subject to copyright and intellectual property rights", "you may not redistribute it or sell it in part or as a whole", and other assertions that make this sound bank non-free and unsuitable for the FreePats project.