USB port on Technics SX-PR54

Hi. This is my first post to the forum after joining with Mike's help. I am not a keyboard player, but, for want of a better word, a music coordinator for a church and we have a Technics SX-PR54 keyboard in one of our churches. This model has no lasting internal memory and the organist will record songs direct to a floppy disk, and then if we need to use the same songs on our newer Yamaha keyboard in another church, we copy from floppy disk to PC to USB drive. Nowadays that is a bit anachronistic as many PCs do not have floppy drives, and the clunky process is rife with opportunities to make a mistake. I am intrigued to see that the SX-PR54 has a USB port and would like to know what it's purpose might be? I was hopeful that it perhaps came with some software that would enable us to drive the recording functions externally and obviate the need for a floppy disk. However, there is no evidence that the keyboard came with any software disk or CD. Any suggestions would be much appreciated.