I would recommend making use of the A/D and D/A converters (audio in and out) to retain the sampler's Mojo rather than resort to file swapping, but if you did want to transfer data from a standard S900/S950 then you have two options, floppy disk or MIDI. Floppy is the fastest method but it relies on your computer's ability to work with Akai floppies, there are a few programs for the PC, but my experience is limited to swapping disks between my S950 and Atari ST. The second transfer option is called a MIDI sample dump and the original idea behind the protocol was to enable the transfer of a sample from one sampler to another via MIDI cables and it soon also became the standard way to transfer samples to a computer for editing, unfortunately the transfer speed of a MIDI sample dump is notoriously slow.