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From the Manual.....
"All three waveforms offer oscillator synchronisation, which is enabled by pressing the SYNC switch. Oscillator sync causes an oscillator to get periodically reset to zero phase, using a second "master" oscillator. Whenever the master oscillator has completed a cycle, it resets the "slave" oscillator. If the master oscillator has a lower frequency than the slave, the result is a new timbre, as the slave oscillator is not always able to complete a full cycle. In contrast to traditional synthesizers, no extra oscillator is needed to perform oscillator sync in Dune. When sync is enabled, Dune automatically generates a virtual
master oscillator needed to perform the synchronisation. The frequency of this oscillator
is adjusted by the frequency knob (FREQ), relative to the given pitch. The sync frequency can be
modulated using the modulation matrix.