The box above is the one thing to watch. With Frequency A and B matched, it stays green for any value of Δφ₀ you drag to — that's the real definition on this slide: synchrony means a consistent phase relationship, not specifically a zero one. "IN PHASE" (0°) is only the tightest special case of synchronous; a steady 45° lag is still synchronous, just not in phase — the box says which. It also holds green regardless of the amplitude difference, which is the slide's other point: synchrony is a phase relationship, not a power level. Try a clean ratio too — 0.75 Hz and 1.5 Hz, for instance — and the box stays green as "2:1 PHASE-LOCKED": harmonic frequencies can be genuinely synchronous without being equal. The box only turns amber — genuinely not synchronous — when the frequencies share no clean small-integer relationship at all, so the offset can't hold still at anything.

They start in phase (matched frequencies, no offset). Mismatch Frequency A and B and watch them drift apart on their own — no switch needed, that's just what different-speed oscillators do. Auto-drift is a separate, additional effect for when you want drift even with frequencies matched. Once drifting, from either cause, the "PLV correction" slider appears so you can drag them back to lock live. That's standing in for phase-locking value (PLV) / connectivity training — re-coupling two drifted rhythms — which is a different target from μ-tuning (slide 33): μ is about one oscillator's own distance from criticality, this is about the relationship between two.