Allen & Heath W4-USB Multi-Channel Interface:

The USB Audio Option for MixWizard4 Mixers from Allen & Heath is an audio card which can be fitted on any MixWizard4 mixer to enable it to interface with a computer. The card sends 16 audio channels for recording or processing and a return stereo channel for monitoring or effects. The USB Audio Option card neatly mounts within the rear pod of the mixer and the data is available from a USB 2.0 connector at the rear of the mixer. Switches on either side of the USB 2.0 connector allow you to change routing options.

Features:

• All MixWizard4 mixers can be fitted with an optional high quality audio card that will send 16 audio
  channels to a computer for recording or processing and a return stereo channel for monitoring or effects.
• The card neatly mounts within the rear pod of the WZ4 mixer and the data is available from a USB2 connector at the rear of
  the mixer. Switches on either side of the USB2 connector allow the users to change routing options.
• Please note that the option card must be installed by a technically qualified service engineer.