Enable auditing in 10gr2 but some thing is not correct

I enabled auditing db_Extended and if I apply a statement like

update table x set value =1

I can find it ,but if I use Toad or any other tool and update the record directly using the editor

in the auditing I can find only the bind variable in other words the above statement appear like

update table x set value =:A

I need the value my cursor_sharing is exact

Any one can help to get the value I don't need to create triggers cause large number of tables?