They might be using an OSC sync which is a *much* nicer sync than a midi clock sync - sadly it looks like OSC syncing has been pulled from Traktor Pro completely. Also Ableton can only send an OSC clock(only with some tricks) and not recieve one.
I have spent hours to get midi sync working as its supposed too and it just doesnt work - tempo changes arnt tracked by the synced program fast enough to keep up with the changes of tempo so the two programs go out of phase\sync with one another. Basicly it always requires human interaction to keep the two in phase with one another.
My latest project was to try to get an OSC clock out of Ableton(yes it is possible) and get Traktor to sync with it, but then i discovered that Traktor Pro doesnt OSC sync - DOH !
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