These make great sounds for me if I convert them to .wav files and load them into the Grace sampler. Not sure if I have enough patience to build a full blown SFZ instrument, but for a simple instrument to do simple phrases, it sounds like you have a cello player in your living room! You can hear the freaking bow. Over top of a backing part done in sample library player like Garritan people might be fooled into thinking I hired an orchestra if I try hard enough.