Sounds like: A screaming, siren-like lead whose tone tears and shifts as the pitch moves.
An aggressive, harmonically shifting lead built from hard oscillator sync — sweeping the synced oscillator's pitch creates a screaming, siren-like timbral movement.
Open this patch in the interactive PatchpadDigitone II's WAVETONE machine has a genuine hard-sync mode (page 2 MOD = HARD SYNC): Oscillator 1's phase resets each time Oscillator 2's waveform starts a cycle. TUN2 sets the audible pitch and sweeping TUN1 gives the classic screaming, filter-like sync sweep (the manual's description), here as a one-shot Exponential LFO on TUN1 at every note-on so the scream settles as the note decays; FLTR's high ENV depth reinforces it. Hard sync exists on the WAVETONE machine, not FM TONE.
Syntakt's Digital machines have no oscillator-sync parameter documented in this project's research — FLTR PAGE 1's high RESO swept by its own envelope (ENV 44, fast DEC) approximates the scream via resonant filter movement instead of a literal synced-oscillator sweep.
Summit's oscillator sync is real but 'virtual': each of the three oscillators has its own inaudible virtual master oscillator whose frequency offset the VSYNC parameter (0-127) sets, and that master re-triggers the audible oscillator. It is not locked to Oscillator 2. When VSYNC is a multiple of 16 the virtual master is a musical harmonic of the oscillator, and values in between are more discordant, so modulating VSYNC is exactly the classic sync sweep; the manual itself suggests modulating it with an LFO or the mod wheel via the Modulation Matrix. This patch sweeps Oscillator 2's own tuning with Mod Envelope 1 via the matrix, which also moves the virtual master's frequency (it scales with the main oscillator), giving the screaming sweep; sweeping VSYNC itself is the more direct control (an alternative matrix destination).
Osc 1 is VAnalog, whose Timbre knob is the pulse Shape: high values give the harsh harmonics of hard oscillator sync (MiniFreak has no true oscillator sync; this is the closest engine). Detune between its saw and pulse is left at the middle. LFO 1 sweeps Timbre 1 through the Mod Matrix for the screaming sweep. Values are on MiniFreak's native 0-100 scale.
Typhon has no VCO-sync switch — RESON pushed high and swept hard by FILTER ADSR (with a strong EG LEVEL) approximates the screaming sweep via resonant filter movement instead of a literal synced-slave-oscillator pitch sweep. Front-panel knobs are unmarked, so those values are clock positions.
Mutator 1's OSC Sync mode is Hydrasynth's real classic-oscillator-sync mechanism, with its own Ratio parameter controlling how many times per cycle the slave resyncs. Routing Envelope 1 into that Ratio via the Mod Matrix produces a genuine synced-oscillator scream, not an approximation.
True hard sync is literal on Digitone II (WAVETONE), Summit (VSYNC) and Hydrasynth (OSC Sync); Syntakt has none in any machine, so the others use the FM/filter approximations described in their own notes.