Both oscillators at once, for the point where you stop tuning them separately and start hearing them together.
Osc 2 tuning, relative to Osc 1
Set how far Osc 2 sits from Osc 1's root. This does not require re-detecting Osc 2 — it's calculated straight from Osc 1's root plus the interval you pick, and overrides whatever root Osc 2's own tab has set.
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Resulting chord — all 6 voices
Every voice across both VCOs and both pairs of subs, low to high.
