Radial Key-Largo User Guide
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Using The Key-Largo™

The Key-Largo is a powerful and compact keyboard mixer and live performance pedal all in one unit. In addition to having inputs for three stereo keyboards and USB connectivity, the Key-Largo has numerous extra features including MIDI in and out, a volume pedal insert, sustain pedal functionality and a switchable effects loop. In order to become more familiar with these various features and how to use them, please see the guide below. For complete details on the Key-Largo, you can download the user manual by clicking on the icon to the left.

Making connections

Before connecting to the Key-Largo, it is always best to turn your audio system levels down in order to prevent plug-in transients that could damage more sensitive components such as high frequency drivers. It is also a good idea to test at low volumes before turning up. This way, should a cable not be properly seated, making a live connection will be safer.

The Key-Largo is powered via a 15VDC center-pin positive supply. A power supply cable lock is located just above this connection, allowing you to secure the cable and prevent accidental disconnection. Unscrew the lock using a hex driver, insert the power cable through the cavity and then retighten.

Connections from your keyboards to the Key-Largo are done using standard ¼" TS coaxial cables. The main outputs to the PA system are typical XLR connections wired to AES standard pin-1 (ground), pin-2 (+), and pin-3 (-). The Volume pedal, Monitor, and Effects Send/Receive connections are ¼" TRS jacks wired tip (+), ring (-), and sleeve (ground).

Using the Key-Largo

There is no power switch on the Key-Largo, as soon as you connect the power supply the ON light on the front of the unit will illuminate and the Key-Largo will be active.

Connect your first keyboard to INPUT-1 Left and Right (if using a keyboard with only one output, connect to the Left/Mono input, the Key-Largo will automatically reconfigure this channel for mono), then connect the MAIN OUT to the PA or a set of powered speakers via XLR cables. Start with the CH-1 level control at around 12 o’clock, and slowly turn up the MAIN level until you can hear your first keyboard. Repeat the process with your next two keyboards, using the input levels for each channel to balance the levels between them. The MONITOR outputs allows you to connect to an additional set of powered speakers via TRS cables, for local monitoring on stage or to send to a headphone amplifier. Should you experience any hum or buzz due to ground loops, the MAIN and MONITOR outputs are each equipped with a ground lift switch to help eliminate this problem.

Going digital

The Key-Largo features a Type-B USB connection, and requires a USB 2.0 cable to connect to the port on your computer or laptop. This is a common 'TYPE A to TYPE B' cable that is compatible with the majority of printers, hard drives and audio interfaces.

If using with a Mac, the Key-Largo is plug-and-play, with no drivers required. Upon first use, if your audio software does not immediately recognize the Key-Largo, try restarting your Mac with the Key-Largo connected. For users running Windows, please visit www.radialeng.com/radial-drivers.php to download the latest drivers for the Key-Largo. Install these drivers before connecting the Key-Largo to your computer via USB.

Once connected to your computer via USB, the Key-Largo will appear in the list of available audio devices in your system setting/control panel. The Key-Largo functions as a 2-in/2-out audio interface, so you can set it as your audio input device (for recording audio into your digital audio workstation), and as an audio output device (for playing back audio from your computer through a PA system). When playing back audio from your computer, the USB LEVEL control affects how much is mixed in with your keyboards and fed to the MAIN and MONITOR outputs. Test this output with the volume turned down, then slowly increase the level until you reach a good balance with the instruments connected to channels 1-3.

The effects loop

The Key-Largo is equipped with an effects loop to allow you to share outboard effects units across all of your keyboards. This feature can be used with both mono and stereo effects, as well as with pedals or rackmount equipment. A latching footswitch turns the loop on and off, so you can quickly add in a delay or a chorus and have it affect each keyboard as much or as little as you want.

For mono effects, engage the recessed switch on the left side of the Key-Largo. Then connect the SEND jack to the input of your effects unit, and the output to the RECV jack using ¼" TS coaxial cables.

For stereo pedals and effects, make sure that the recessed Effects switch is disengaged. Use insert cables wired with ¼" TRS to 2x ¼" TS connectors to connect the SEND jack to the left and right inputs of the effects unit, and use a second insert cable to connect the outputs of the device to the TRS RECV connector on the Key-Largo.

Start with the EFX RECV level control at 12 o'clock, this controls how much of the overall FX you will hear in the mix. Engage the EFFECTS footswitch on the Key-Largo and slowly turn up the EFX SEND control on each channel that you want to send to the effects loop. The EFX SEND controls follow the input level controls in the signal chain, so if you turn down CH-1 LEVEL, you'll also be reducing the amount of signal sent to the EFX SEND on channel 1. Note that when the Key-Largo is set to Recording mode, the EFX SEND for the USB input will not be active.

Adding sustain

The Key-Largo features a dedicated footswitch to act as a sustain pedal for one of your keyboards. This is a momentary non-latching switch, so it will only apply sustain when you are physically pressing down on the switch. Connect the SUSTAIN OUT to the Key-Largo to the connection on your keyboard for a sustain pedal. Test by playing a note and holding down the sustain footswitch. If the footswitch works the opposite way you expect it to (sustain is always on, except when the footswitch is pressed), then engage the recessed sustain switch on the side of the Key-Largo, to change the connection from normally open to normally closed.

Adding a volume pedal

You can use an external stereo volume pedal to control the overall output of the Key-Largo, giving you control over all your levels in one place. Simply connect the Volume SEND on the Key-Largo to the input of your pedal, and the output of your pedal to the RECV connector using ¼" TRS cables or TRS>2x TS insert cables. The volume pedal will control the level of the MAIN OUT, MONITOR OUT, and the USB send to your recording software. Note: When the Key-Largo is set to recording mode, any USB audio output from your computer to the Key-Largo will not be affected by the volume pedal.

Using with MIDI

The Key-Largo can send and receive MIDI information over USB, allowing you to use a controller to play a soft-synth on your laptop, or record and playback MIDI using your computer’s digital audio workstation (DAW). The Key-Largo doesn't generate MIDI information on its own, nor can it be controlled via MIDI; it simply transmits the information between the MIDI and USB connections.

To send MIDI to your DAW to control a soft-synth, connect the MIDI output of your keyboard to the MIDI IN on the Key-Largo using a standard MIDI 5-pin DIN connector. Please refer to your DAW's manual for instructions on how to set up a MIDI record/playback track or soft-synth. To playback MIDI information from your computer to control an external device, connect the MIDI OUT on the Key-Largo to the MIDI input on your keyboard or other MIDI-enabled device.

Recording vs. live mode

The Key-Largo has two modes, set via the USB ASSIGN recessed control on the side of the unit. When this switch is disengaged the Key-Largo is set to LIVE mode. This means the USB audio from the computer is treated like any other keyboard input; you can send it to the effects loop, blend it with the other keyboard inputs, and control it with an external volume pedal. Most players will keep the Key-Largo in LIVE mode for the majority of the time, especially when using the device during a performance.

When the recessed switch is engaged, the Key-Largo is in RECORDING mode, and the USB audio from the computer is sent directly to the MAIN and MONITOR outputs. This configures the Key-Largo for use as a USB recording interface for tracking and overdubbing keyboards. You can use the volume pedal to control your performance without affecting the backing tracks that you’re playing along to, and the effects loop will only affect the inputs that you’ll be recording. In this mode, the USB EFX SEND will not be active, and an external volume pedal will not affect the signal returning from the computer.