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Programmer’s Reference

Launch Control Programmer’s Reference 2

1 Introduction

This manual describes Launch Control’s MIDI communication format. This is all the proprietary

information you need to be able to write patches and applications that are customised for Launch

Control.

It is assumed that you already have a basic knowledge of MIDI, and some appropriate software

for writing interactive MIDI applications (for example, Max for Live, Max/MSP, or Pure Data).

Numbers in this manual are given in both hexadecimal and decimal. To avoid any ambiguity,

hexadecimal numbers are always followed by a lower-case h.

2 Launch Control MIDI Overview

Launch Control is a class-compliant USB device that boasts 8 pads and 4 buttons. Every pad

contains a bi-coloured LED with a red elemen and a green element; the light from these elements t

can be mixed to form amber. Each button contains a single red LED. Launch Control has 16

templates: 8 user templates, which can be modified, and 8 factory templates, which cannot. User

templates occupy slots 00h-07h (0-7), whereas factory templates occupy slots 08-0Fh (8-15). Use the

Launch Control Editor (available on the Novation website) to modify your 8 user templates.

Launch Control has a single MIDI port named Launch Control , where is the device ID of your ‘n’n

unit (not shown for device ID 1) T. he pad LEDs for any template can be controlled via System

Exclusive messages. Alternatively, pad LEDs for the currently selected template can by controlled

via MIDI note-on, note-off, and control change (CC) messages, as per the original Launchpad

protocol.

Launch Control uses a System Exclusive protocol to update the state of any pad on any template,

regardless of the currently selected template. In order to maintain compatibility with Launchpad

and Launchpad S, Launch Control also adheres to the traditional Launchpad LED lighting

protocol via note-on, note-off and CC messages. However, such messages will only be acted upon

if the currently selected template contains a pad whose note/ value and MIDI channel match CC

those of the incoming message. Users are therefore advised to adopt the new System Exclusive

protocol.

In addition, Launch Control also supports the original Launchpad double-buffering, flashing and

set-/reset-all LED messages, where the MIDI channel of the message defines the template for

which the message is intended. These messages can therefore be sent at any time, regardless of

which template is currently selected.

The state of each LED is stored when the template is changed and will be recalled when the

template is reselected.

Launch Control Programmer’s Reference 3

3 Computer-to-Device Messages

LEDs on the Launch Control can be set via two different protocols: (1) the traditional Launchpad

MIDI protocol, which requires the currently selected template to contain a pad whose note/CC

and MIDI channel correspond to the incoming message; and (2) the Launch Control System

Exclusive protocol, which will update the required pad regardless of its note/CC value or MIDI

channel.

In both protocols, a single byte is used to set the intensities of both the red and green LEDs. This

byte also includes the Copy and flags.Clear The byte is structured as follows (those unfamiliar with

binary notation can read on for the formula):

Bit Name Meaning

6 Must be 0

5..4 Green Green LED brightness

3 C lear If 1: clear the other buffer’s copy of this LED

2 Copy If 1: write this LED data to both buffers

Note: this behaviour overrides the Clear behaviour

when both bits are set

1..0 Red Red LED brightness

The Copy and Clear bits allow manipulation of the Launch Control’s double-buffering feature. See

the ‘Control double buffering’ message and the Appendix for details about how this can be used.-

Each LED can therefore be set to one of four values:

Brightness Meaning

0 Off

1 Low brightness

2 Medium brightness

3 Full brightness

If the double-buffering features are not in use, it is good practice to keep the Copy and Clear bits set

when turning LEDs on or off. This makes it possible to use the same routines in flashing mode

without re-working them. A formula for calculating velocity values is:

Hex version Velocity = (10h x ) Green

+ Red

Flags +

= (16 x ) Decimal version Velocity Green

+ Red

Flags +

where Flags = 12 (OCh in hex) for normal use;

8 to make the LED flash, if configured;

0 if using double-buffering.

Produktspecifikationer

Varumärke:	Novation
Kategori:	Tangentbord
Modell:	Launch Control
Inbyggd display:	Nej
Bredd:	240 mm
Djup:	118 mm
Höjd:	39 mm
USB-anslutning:	USB Typ B
Inbyggd optisk enhet:	Nej
Produktens färg:	Grå
Apple-kompatibel dockningsmöjlighet:	Stöds inte
USB-port:	Ja
Nätaggregatstyp:	USB
Mixerfunktion:	Ja
Bakgrundsljusknappar:	Ja