The best, and easiest way to record audio to your PC is to do it directly from the keyboard's standard output to the PC's sound card. There are several good programs for doing this, one of which is free. You'll find all the instructions at 
http://www.psrtutorial.com/lessons/playing/rec/20MakeCD.html Good luck,
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.)