Arturia KeyLab 88 MkII [12/89] The rear panel

1.4. The Rear Panel

1. Pitch/Gate/Mod outputs These four connectors allow the KeyLab mkII to send

control voltages and triggers to a modular synthesis system. The voltage ranges

may be defined in User Edit mode [p.45] or by using the MIDI Control Center

[p.62].

2. MIDI In / Out KeyLab mkII's MIDI Out connector will send USB / MIDI data

to external devices, and can do so without a computer when powered with the

optional power supply. The MIDI In connector receives MIDI data from external

devices, and also serves as a MIDI / USB converter for your DAW.

3. Aux 1/2/3 Pedal Inputs These three pedal inputs can be used with a continuously

variable pedal or a footswitch. They can be assigned to any MIDI CC number

from within the KeyLab mkII [p.43] or by using the MIDI Control Center [p.62].

4. Expression Pedal Input The Expression pedal input can be used with a

continuously variable pedal or a footswitch. It sends MIDI CC# 11 by default, but

it can be reassigned from within the KeyLab mkII [p.43] or by using the MIDI

Control Center [p.62].

5. Sustain Pedal Input The Sustain pedal input automatically detects the polarity of

the pedal when KeyLab mkII is turned on, so it can be used with any standard

pedal. It also can be configured to work as a continuously variable pedal from

the front panel of the KeyLab mkII [p.43] or by using the MIDI Control Center

[p.62].

6. CV In Use this connector to route a control voltage output from a modular

synthesizer into the KeyLab mkII. This input can be used as a CV-to-MIDI

converter and/or a CV-to-USB converter. The voltage range may be defined from

the front panel or using the MIDI Control Center [p.62].

7. USB Connection Use this to connect KeyLab mkII to your computer. This port

provides both power, MIDI data, and control information.

8. Power connector If you'd like to use KeyLab mkII as a controller without a

computer attached, connect an optional 9-12v DC 1.0A power supply here.

9. Power switch This on/off switch works the same whether the unit is powered by

USB or by the AC adapter: up is on, down is off.

1.4.1. Something to consider: Ground loops

A ground loop is an unwanted current in a conductor connecting two points. The result

is noise in your audio signal, usually in the form of a low-frequency hum. In setups

involving computers, CV/Gate connections, and audio devices, it's possible to end up with an

annoying ground loop. We have provided a solution, however: the anti ground loop adapter.

1.4.1.1. When should I use the anti ground loop adapter?

In most cases you will not need the anti ground loop adapter.

If you don't have a ground loop problem in your setup, simply connect the KeyLab mkII

with the supplied USB cable to a computer or with an optional 9-12v DC 1.0A power supply.

7 Arturia - User Manual KeyLab MkII - Getting Started