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A fast radio burst leaves its source at every frequency at once, but the free electrons it crosses on the way to Earth slow low frequencies down more than high ones — the classic dispersion sweep. This 2D companion to the 3D dedispersion lab makes that column of electrons an actual object: a line-of-sight strip built from a mix of smooth background and random turbulent clumps, all summing to your chosen dispersion measure. Rather than plugging that DM into the textbook formula, the engine numerically integrates each frequency channel's group-velocity delay segment by segment through that real density profile, then cross-checks the result against the closed-form K·DM/f² law live in the readouts. It also layers in a second, independent real effect the 3D lab omits: interstellar scattering, using the empirical Bhat et al. (2004) relation, which gives low-frequency channels a genuine exponential decay tail instead of a clean symmetric pulse — turn up the clumpiness slider and watch CHIME's band smear while Parkes stays sharp.