A session runs upkeep — one pass through every active key and layer, degrees shuffled — then the key you picked above. Finishing a pass puts that key into rotation; the checklist below takes it back out. Nothing here is locked: any key, any layer, any time.
Pips show layers 1 · 2 · 3. Filled = solid (3 consecutive reference-free clean passes). Half-filled = partway there.