The download page says “The sampler also features a powerful sample bank system, so that you can put all samples in a single highly compressed yet fast repository for caching and distribution.” Is the proprietary file format required? Pianobook prefers that the original wav files are available for downloaders so there is not such a distinction between creators and users. Get the samples and use them how you like. This is the beauty of the SFZ and DecentSampler formats. If I download a samplepack in MSoundfactory format, how easy is it for me to alter it?