Walrus Audio DFX-1 Percussion Processing Multi-Effect Unit, BlackDrummers and effects units could opposites attract? With the Walrus Audio DFX 1 Percussion Processing Unit, they certainly can. For recording and performance, Walrus steps up for drummers and percussionists with their high fidelity effects specifically fitted for rhythm processing acoustic or otherwise. Classic percussion friendly effects like compression, delay, reverb, and saturation all align in a workstation ready form to create and inspire. For