You do need software that allows you to use SYSEX. The site that you downloaded the banks from might have it. Programs like Cakewalk also have sysex. The X3 needs to be able to receive SYSEX and then it is just a matter of loading the sounds into the program and clicking SEND ALL or something simiar. I wouldn't worry though. You should be able to do this with no problems and your synth will be like new. Keep in mind that if it was used then you have lost some patches that have been edited.