Hi, Anyone by chance developed an atan~ (or pref. an atan2~) object? Cheers (lazily), Nick -- Dr Nick Fells, Music Department, University of Glasgow, Tel: +44 (0) 141-330 4096 Glasgow G12 8QQ Fax: +44 (0) 141-330 3518 UK. http://www.music.gla.ac.uk/~nick