No DJ mixer's beatcounter is reliable, the midi output is for syncing effects and is not accurate enough to sync music.
You need one of these
http://www.dooyoo.co.uk/dj-equipment...ager-1/251238/
"The Redsound Voyager is a very powerful 'box of tricks' that connects to 1 or 2 audio sources and monitors the beat of the music from both of them . It then converts this information to MIDI data and transmits it to any other MIDI device . I didn't know too much about how MIDI worked before I bought the Voyager - and like everything I buy I hoped that it'd be one of these things you could plug in and 'it would just work' .
Thankfully I wasn't far wrong ! MIDI defines a standard for communication between any device that supports it - samplers , keyboards , audio software on your PC .. the list is endless . Instead of sending data as audio it sends it via instructions on 'channels' and lets the device at the other end deal with it . The Voyager simply transmits MIDI clock and start commands to other devices . Start commands allow you to kick off another device at a point in time - sort of like giving your band a countdown of 3-2-1 and then all starting together . It's the MIDI clock though thats more interesting as it acts like a universal drumbeat defining the tempo so that all of the devices that are listening will keep in time .
Anyone who knows a bit about DJing knows that this is what beat matching is all about - trying to get 2 records that play at different tempos to play at the same speed so you can mix between them . The Voyager sits between 2 decks ( or any 2 phono / line inputs ) and synchronises any external MIDI device to play back in time with the music . This is a godsend for DJs ! I've got one of these rigged up between 2 decks sending output to a sampler ( Yamaha SU200 ) and t o Rebirth on the PC . This allows you to have a tune playing on one deck and play back drum loops from the sampler together so you can effectively do remixing on the fly . "
Don't think they make em anymore but I picked one up second hand for around $100 USD