Bryan,
Quickly - in middle of something.
"Take them out to the loo for a quick audition? Refuse to put them on in case they weren't any good? "
Sorry, crossed wires - the case I cited was of somebody who came back week-after-week for a year - I (mis?)understood that your policy was to allow people to sing whether they could hold a tune or not as a point of policy.
For me there has to be a point where you say - "go off and do some work".
Jim Carroll