Xequence AU | Keys is a keyboard controller designed for music production enthusiasts, specifically for use within AU (Audio Unit) hosts like AUM, Cubasis, and apeMatrix. It offers a highly acclaimed keyboard known from Xequence, an advanced MIDI workstation, with over 70 scales in 10 categories included. The keyboard is fully scale-aware, allowing for single or dual keyboard play, and features customizable key width and a unique "Glide" mode for sliding between keys.

Additionally, Xequence AU | Keys supports unlimited instances, full AU presets, and state saving/restoration within the host. Users can configure keyboard color, MIDI channel, and freely set up any number of MIDI CCs as touch ribbons. Special controller modes provide a dynamic, MPE-like experience for enhanced control over music production. Note that this app requires an AUv3 Audio Unit Host to function.