stem seperation

Hi 

I must advise that rekordbox stem seperation is way to abrupt and at times certain songs (tracks) is not operational when stems are activated as virtual dj stems. I mean when  the drums button is activated it does not necessarily cut out only the drums -there is more than one instrument that cuts off and abruptly, to elaborate further if one has to play a hip hop track and activate the instrumental it might work well but when one has to play a house track and activate the instrumental a totally different approach is going on with that track - not sure if one understands . when one has to activate the vocal button on virtual dj then the vocal and only the vocal cuts off totally, like wise when one activates the drums button then only the drums cuts off, this is how rekordbox was supposed to work and not just put up stems seperation to be competing in the market - if it has to be done then t should be done right and not put there for the sake of it - hope rekordbox can work on this as the program as awhole works well for me .