Reference
Flux Memory Lane
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The flux lane is not a full tape or transformer model. It is a lighter path-dependent abstraction that gives rising and falling trajectories slightly different behavior. The purpose is to capture some of the audible benefits associated with hysteretic systems, such as attack rounding, denser lower mids, and small return-path differences, without the CPU cost of a high-detail physical model.
The lane stores a memory variable whose update rate depends on signal direction. A loop-area control blends the memory term into the nonlinear input, while a damping term prevents the memory from turning into an obvious resonant artifact.