@piterman, cool software and creative mind. I never thought of back track can be develop this way. hmm.. did you consider to develop a software for people who like to sing but not good in singing like me? I love to sing but it always out of tune.(hope you know what i mean). It would be very good if there is an apps which it can helps with our tune ;)
Keep up the good work!!
RE: Making a backing track : Everybody wants to rule the world