My sound card can take off the vocals and can change the pitch to high and low. But it can't make the tempo go slower or faster. Some techno music are remixes from love song and their tempo are faster than the original love song. What software could be used for the tempo?

hey bud.. i myself only got a mixer.. and i use virtual dj.. its an GREAT program.. all you need is an 4.1 or better sound card and some digital to the red and white cables (whatever they are called). Works great :D.. u get a large selection of music and u get cool things like effects and a beat grid :)