Tried a capo on our lead singer (male) - it seems to work better when placed on the body area - about half way along - rather than on the neck as this only muffled the sound and caused a strange blue shading in and around the area of the neck and head. Some of the notes when placed on body seemed a little erratic but they certainly were a lot higher than usual - this also gave a strange colour change to the head area this time red not blue!

Will try two capos when he comes around next (as in when he wakes up!)

Any more good ideas out their -

Pete