:: The human variable (hand turning) is a :: big factor. Would some form of 'fuzzy logic' algorithm help sort out the wheat form the chaff? Colin -- cdb, colin@btech-online.co.uk on 5/11/2008 Web presence: www.btech-online.co.uk Hosted by: www.1and1.co.uk/?k_id=7988359 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist