Users can mix up to 8 channels, mono or stereo, selected from a pool of 24 sources (prepared in Admin mode). Each channel has a fader for level control, input metering and on/off button. In addition, there are four icons at the top of each channel strip for assigning onto the programme, record or PFL bus, and opening the settings pop-up window (to edit autogain, automix, pan/balance and processing such as EQ and Compression).

The 8 channels can be assigned to the stereo programme bus, plus a second stereo bus (operating in either record or conference mode). On the right of the GUI are the stereo headphone (PHONES) and loudspeaker (SPEAKER) outputs. Each has its own monitor source selector and level control. The meter at the top left of the GUI can be switched to the programme bus, record/conference bus or headphone output.

An N-1 output, also known as a clean feed or mix minus, can be created for up to 4 of the 24 audio sources. This enables a contributor to hear the programme mix minus themselves.

Up to 8 snapshots provide easy access to commonly used setups, and 16 user keys offer fast access to functions such as a COUGH switch, monitor DIM, TALK to an N-1, GPIO commands, etc. In each case, the main functions are always directly available with additional options stacked in drop-down menus (indicated by the down arrow).

The LIVE! box, at the top of the GUI, indicates the on-air state (red = on-air, grey = off-air), and the real time clock offers a variety of TIMER functions to assist with programme timings.

The GUI can switch between two views: Fullscreen or Taskbar; the example above is Fullscreen. In Taskbar view, the main functions are condensed onto a single Taskbar which remains visible while accessing other applications.

The GUI also supports two modes: User or Admin; the example above shows User mode. Administrator mode is password-protected and is used to prepare audio sources and processing, the bus outputs, snapshots, user keys and all global settings.

On Air 4 Specs:

• 4 mono mic/line inputs (XLR+TRS combo connectors)
• ·  4 stereo headphone outputs (TRS)
• ·  4 mono line outputs (2xXLR, 2xTRS)
• ·  1 stereo S/PDIF digital input (RCA)
• ·  1 stereo S/PDIF digital output (RCA)
• ·  5 GPI inputs / 5 GPI outputs (DB-15)
• ·  Lawo “plug-in” processing.There is also an AES 67 / RAVENNA Gigabit Ethernet port for connection to the host computer (or IP network).Note that the OnAir4 can connect to your PC either directly, as shown above, or via a RAVENNA compatible network*.*In a networked installation, all components (network switches, etc.) MUST meet the qualifying data network requirements.