Ted Kendall: > A straight arm on a pivot does not mimic the way a record is cut. > All modern lathes move the cutter along a radius of the disc. A > straight arm without offset traces a deep arc which bears little > relation to the cutter's path, hence the need for offset. The straight line tangential tracking arm mimics perfectly well the actual professional cutting head. http://www.aardvarkmastering.com/history.htm -- Best regards, Goran Finnberg The Mastering Room AB Goteborg Sweden E-mail: [log in to unmask] Learn from the mistakes of others, you can never live long enough to make them all yourself. - John Luther