Welcome to the PSR Tutorial Forum, Hangdog Cat! I wish you a lot of fun and joy with your PSR-SX900.
Playing external styles is very easy:
- First unzip (unzip) the downloaded zip file(s) on your computer so that you have one or more folders in which the style files are located. (Style files, for example, have the extensions .sty, .prs, .sst, .fps).
- Copy these folders with the styles onto a USB stick and connect it to the SX900.
- In the SX900 Home display, touch the name of the current style to open the Style Selection display. There touch "User > USB1" to display the folders and files on the USB stick.
- Touch the desired folder to open it and touch the desired style to load it. Close the Style Selection display (touch the X icon or press the EXIT button).
- Now you can play the style as usual.
By the way, you can also copy frequently required styles from the USB stick to the internal User drive and then use them from there in the future. This works via "File > Copy" in the Style Selection display. However, it is not necessary, i.e. you can also work exclusively with the USB stick.
Hope this helps!
All the best from Germany,
Chris