Almost all of these instruments were made using the great padsynth tool to generate the source sounds; http://www.renoise.com/tools/padsynth
I love that after running the tool generating a multi-sampled instrument you can edit the individual channels & samples, possibly rendering in fx in the sample editor, exaggerate pan positions & offsetting different sample loop distances to create wide detuned sounds. Ideal for rave stabs and effects, add some modulation options and minor fx-chain and why need vsti? :-)