AU3FX:Push is a highly customizable stereo dynamics processor designed for iPhone. This app, developed by Kymatica AB, is part of the AU3FX series, offering a range of audio unit effect plugins. It features a 32-bit DSP engine, a compressor/expander with optional lookahead buffer, and a noise gate, among other functionalities. Users can achieve anything from subtle compression to extreme pumping and maximum loudness with this versatile tool.

The app supports various features like negative ratios for special effects, built-in side-chain filters, external side-chain input, brick-wall lookahead limiter, and hard/soft clippers. It also includes RMS/Peak envelope followers, makeup gain, stereo link options, and the ability to use multiple instances simultaneously. With bundled presets and the capability to save/load session states, AU3FX:Push provides a comprehensive audio processing solution.