Here are some great free Halloween Sounds and effects for Yamaha keyboards:

http://www.cms-sounddesign.de/page16.html

Look under CMS Halloween. Scroll down to listen to the demos.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer