Abstract This note studies mixed-multiplicity sharpness in local integer convolution readouts. A previous completion-seam result showed that a local readout can acquire a coarser gcd grain when a binary support geometry completes every kernel footprint sampled by the readout. Here the support model is extended to additive layering. One completed support layer is held fixed while a second layer enters the same local readout window. When the second layer also completes every footprint, all local overlaps are uniformly rescaled: the raw gcd doubles, while the normalized local probabilities and reduced modes are unchanged. When the second layer is partial, the readout enters a mixed-multiplicity regime. In the deterministic examples studied here, the overlap values form a small geometry-generated alphabet, the local gcd collapses to 1, and no robust affine residue lock is observed under the bounded finite-character diagnostics tested. The result separates three local arithmetic regimes: pure completion, uniform multiplicity scaling, and mixed multiplicity. It provides a controlled static precursor for later walker-ensemble and wake-construction studies.
John James (Sun,) studied this question.