First off, I apologise if this is the wrong forum to post the question in.
Also, I am asking on behalf of my 15 year old half-brother, and he lacks specific details over what equipment he needs.
He happily drew an image which may give people an understanding of what he is after.
The problem is the jack for the microphone cord is a stereo based jack(labelled 'Stereo') in which does not fit into the microphone plug on the computer (labelled 'Jack'). What is the device we need to convert the stereo jack to one suitable to fit into the computer?
(My half brother wrote the last paragraph)