Allen & Heath QU-SB 18-In/14-Out Digital MixerTake Control of Your Sound with Ultimate Portability The Allen & Heath QU SB is an ultra compact digital mixer designed for iPad control, allowing you to mix from anywhere in the venue. It's a smart, portable solution for bands, AV setups, and installations. With the intuitive QU Pad app, you can access a wealth of features and setup options. Expandable up to 32 mono inputs and 24 outputs via remote audio racks, plus integration with the QU You