In the words of Ashville Music Tools:

The Analoger Series AFG-1 is a 100% analog dynamic flanger with some unique differentiating features. Its lush swirls, vocal comb filter sweeps, and metallic flourishes can be controlled with the on-board LFO, or articulated by your playing dynamics with our bi-directional, multi response envelope follower. By drawing from synthesizer-style architectures and elements of beloved vintage rack effects, Hawker has designed this modulator from the ground up to go where no classic flanger has gone before.