you mean using like a link cable midi connection?
or... something else?
also when you do it by midi, is it just a trigger then, or does the sound come through?
I'm using an arduinoboy mini (you don't *have* to sync via midi as goatslacker says but I have the gear) and in LSDJ sync mode it just sends start, stop and clock signals but in mGB mode you can make it essentially midines.