Sarah,
The only Korg styles that will play in the PSR-3000 are those that have been converted. Unzip those I just emailed to you, copy them to a USB Thumb Drive, and take the unzipped files with you to the store. Plug in the USB drive into the back of the keyboard, press the USER style button on the upper-left side of the keyboard, tab to USB and select the style files. You're going to like what you hear.
Good Luck,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)