AUM - Audio Mixer 1.4.5

AUM is a versatile audio mixer, recorder, and connection hub for iPad, iPhone, and iPod touch. It allows users to connect various hardware inputs and outputs, Audio Unit extensions, Inter-App Audio apps, Audiobus, soundfile players, built-in signal processing and filters in any desired configuration.

This app offers the ability to route audio signals anywhere through mix busses, effect sends, audiobus ports, and external multi-channel audio interfaces. Users can also play hosted synths and instruments using the built-in keyboard or external MIDI controllers, as well as sequence them with AU MIDI plugins or from other apps using Virtual MIDI.

A noteworthy feature is the ability to record mixes, individual tracks, or both directly into the storage space of AudioShare without the need for file copying. The app also allows for playback of recordings, soundfiles, and loops as channel sources in the mixer for backing tracks, further processing or mixing. Soundfiles can be opened from various sources including USB drives on iOS 13 and later.

Additionally, AUM provides a MIDI matrix that allows for routing and filtering MIDI in any desired manner. Users can combine and filter MIDI endpoints using MIDI buses.

The app also offers synchronization features such as transport clock synchronization with other apps or devices using Ableton Link. It also allows users to connect external music machines and synchronize them with MIDI Clock.

Users will benefit from built-in processing nodes for stereo processing, Mid/Side balance and conversion, EQs and filters, limiting, clipping, and saturation. Alternatively, they can use any 3rd party Audio Unit extension or Inter-App Audio effect.

One notable aspect of AUM is its ability to control all mixer controls via MIDI, including parameters of hosted and built-in plugins.

AUM has received positive reviews from various sources. MusicAppBlog describes it as "a brilliant idea that has been brilliantly executed" and highly recommends it. DubSpot praises its feature-rich, powerful, intuitive, and simple-to-use nature. AudioNewsRoom commends its ease of use, extensive features, quick snappy response on the screen and audio execution of live mixing.

Key features of AUM include high-quality audio up to 32-bit 96kHz, a clean and intuitive user interface with crisp vector graphics, compact and optimized code resulting in a small app size, support for an unlimited number of channels and effect slots, configurable inserts and sends as pre/post-fader, internal busses for mixing, effect sends, and signal splitting, support for multi-channel audio interfaces for inputs and outputs, compatibility with built-in speaker and mic (including stereo mic on compatible devices), support for Audio Unit extensions, Inter-App Audio, and Audiobus, routing MIDI output from Audio Unit extensions, support for Audio Unit multiple output and input busses, Audiobus state saving, highly accurate transport clock, metronome with selectable output and optional pre-roll, support for Ableton Link with Start/Stop synchronization, MIDI Clock sync for external hardware, built-in FilePlayer for sync and looping of soundfiles, ability to record directly into AudioShare storage space with synchronized beat-perfect loops, built-in nodes for stereo processing, filtering, and dynamics, latency compensation for precise alignment at the outputs, optional manual compensation using TimeOffset setting, multiple Inter-App Audio / Audiobus output ports, built-in MIDI keyboard, full MIDI controllability, MIDI Matrix for routing MIDI anywhere, and MIDI filtering for any MIDI destination.

The app also includes various built-in signal processing capabilities such as stereo balance control, stereo to mono conversion, stereo panning, Mid/Side balance control, Mid/Side to stereo conversion, phase inversion, parametric EQ, low-shelf filter, high-shelf filter, low-pass resonant filter, high-pass resonant filter, LP/HP combo filter, first-order all-pass filter, second-order all-pass filter, gain adjustment, hard clipping, saturation, and lookahead peak limiting.