You need a MIDI interface to hook the TR-Rack to the computer so you can trnasfer the SYSEX files.

Utilizing an editor such as Midi Quest or a dedicated editor such as Kevin Goodman's Trinitro (very good for the Tr-Rack) will allow you to edit virtually every parameter on the TR-Rack. The LCD screen on tghe Rack doesn't allow you to change a lot of things, especially the multisamples used. With an editor, you can change those too.