I just added 3 new multisamples in SFZ format to the FSA website: a resynthesized bass guitar (recorded direct, then processed with software for analysis & resynthesis via additive synthesis) , an FM bass sound, and a “synth vox”-style pad I made on a Kurzweil K2000S.
See the Samples page at the Fugue State Audio website. All of the samples there are free to do with as you please (as long as you don't try to re-post/share them as-is as your own), though donations and/or upvotes are always appreciated. :)