Othen than holding down on a key, I don't know of any function that would drone a note. As for the bagpipe, yes it's in the flute and woodwind section, and in the hands of an accomplished Scottsman it sounds terrific. For an example of this download Will Stewart's Album #6 from
www.psrtutorial.com and listen to the effects he uses at the end of Mist Covered Moutains.
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.)