Check in at
www.psrtutorial.com and you'll find instructions on how to downgrade. As for the sounds, you can only use edited onboard sounds. However, if you take the time to explore the keyboard's onboard Sound Creator program you will be amazed at what it can do.
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.)