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Dynamic AdS/QCD is a modification of AdS/QCD that includes the running of theanomalous dimension of the q-bar q quark bilinear and in which the generationof the constituent quark mass plays the role of an IR wall. The model allowsone to move away smoothly from the controlled spectrum of the N=2 superYang-Mills theory of the D3/probe-D7 system to more QCD-like theories withchiral symmetry breaking. We investigate soft wall behaviour in the model thatgives Regge trajectories with M_{n,s}^2 ~ n,s. To achieve these behavioursrequires the quark's constituent mass to fall peculiarly sharply in the IR sothat meson physics is sensitive to RG scales well below the quark's on-shellmass. Including soft wall behaviour in models of walking gauge dynamics breaksthe near conformal symmetry which is present above the quark on-shell masswhich can generate a large mass for the techni-dilaton like state. We concludethat the meson spectrum is rather sensitive to the IR decoupling.

Soft Walls in Dynamic AdS/QCD and the Techni-dilaton