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How much each new pass echoes the last.
Low gives you fresh variety every refresh. Higher gives a continuous evolution, where each pass carries something of the one before it.
0 to 1.0
0.3–0.5 is the sweet spot
Why it matters
The difference between a sound that keeps surprising you and one that drifts somewhere over time. It needs Strength below maximum to do anything — at full Strength there is nothing of the previous pass left to echo.