Kymatica has released AUFX:Push aspart of their AUFX series, a collection of simple and powerful audio effect apps. They describe it as a highly tweakable stereo dynamics processor with noise gate, compressor/expander with external side-chain input, and limiter/clipper. A spokesperson said, "This will take you from subtle compression, extreme pumping, to maximum loudness!"
Pricing and Availability:
$4.99 at the app store.
Emulate multiple mics, change proxmity and axis on the fly with UA Hardware