No, I'm afraid there's no hard sync. The ESQ-1 had an okay sounding hard sync but it was an entirely different machine.
The SQ-2 is basically a cut down version of the TS-10 and the TS-10 doesn't have anything like oscillator syncing. Instead it featured something called tranzwaves which is awfully similar to the type of wavetable synthesis featured on the PPG (and later Waldorf) synths. Some of those tranzwaves could sound hard sync like and some even more interesting. Check the manual. I'm not sure if the SQ synths feature tranzwave technology but if they do then you're in for some interesting sounds.
cheers,
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