Thanks for your reply.
Jut to confirm that the level meter next to the microphone icon (bottom right of the screen) IS moving when I sing tones. However the software fails to pick it up as an answer i.e. it ignores my singing despite the fact that teh level meter acknowledges that I am making a ...

When I am in Interval Singing I have set up the microphone and it appears to be working but when I make a sound in answer to a question it doesn't register as an answer although I have the microphone selected as the means of communication

Any possible solutions?