Well i bought those today 2 cdj's & that behringer When we use a master bpm like say 178 we sync our song on the left pioneer. It plays, on our right pioneer we set it also to 178 bpm. but we can never beatmatch it because the one song doesn't play as fast as the other and it gets out of tune. It starts out good but after a while it's all wrong even though the bpm is set on the master. When we don't use master bpm our bpm changes all the time like it starte on 178, Suddently it's 177.7 And we can't figure it out and we'd like to work with the cdj's we bought. Any help?