> > Try the expr family of objects. They support among others: > > Do they ?, > The last time I looked they didn't provide this functionality for > signals, (two months ago). they do. works fine. thanx everybody for help martin > > Guenter > > > martin pi attacksyour.net/pi johann strauss gasse 32 | 7 1040 vienna ++43 699 10 44 37 42 sil.at