Vilo,
You should be able to load most if not all of the PSR-3000 styles into the PSR-1500. I only had a few minutes playing time with the 1500, but from what little contact I had, it sounded very good and had lots of great features.
Cheers,
Gary
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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.)