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Quark. User Manual

5. APENDIX

5.1. MIDI Specifications

A DJ Software have the "mapping" function that assigns MIDI

messages to the different functions of the DJ Software.

We also have to match the DJ Software functions with the

controls of the external device (the controller). We do so by

assigning the DJ Software function and the control the same

MIDI note or message.

Each of QUARK controls generates various MIDI messages

you can see at table QUARK MIDI MAP. We can send the

MIDI messages through channels 1 to 16, this is a MIDI

standard. We can see three different parts on a MIDI message:

- The MIDI code (MIDI CODE) lets us know what type of

message is sent.

- The FUNCTION CODE gives us the note or control value.

- The action let us know the value that the control attains when

is manipulated.

At the table we have a column for each of the three parts of a

MIDI message. The controls are grouped upon their in type so

also upon their MIDI code.

DJ Software's use two types of MIDI codes:

- "Control Note" (switch): the control is a switch (you see a

button) or a LED and will look like NOTE C2. Each note has a

number that at the table is expressed in Hexadecimal (HEX).

Further on at this manual we will explain how notes and

numbers correspond to each other and how to change from

hexadecimal to decimal. In this case MIDI CODE is 9 and

FUNCTION CODE is the note of the control.

- "Control Change" (CC): the control will be a potentiometer or

encoder and will have a label like Cc53. In this case MIDI

CODE is B and FUNCTION CODE is a value between 0 and

127. We will associate a value to each control of the kind.

Upon the value of the action part of the MIID message we will

classify the controls as follows:

a- NOTE-KEY: are note type messages. Action value can be

127 (7FH) when we press or 0 when we release.

b- NOTE-LED: determines the LED that will light, are note type

messages as the switches and the values are 127 for LED ON

and 0 for LED OFF. In the LEDs case it is the DJ Software that

sends the MIDI messages to the controller.

c- CC-ABSOLUTE (VR) - CC "Control Change" Absolute.

These are potentiometer like controls. The action value is a

number between 0 an 127 upon the potentiometer position.

d- CC-RELATIVE (ENCODER/WHEEL) - CC "Control Change"

Relative. These are encoder like controls. As oppose to the

potentiometer that encoder does not send a message to report

its position but only report changes when turning to clockwise

or anticlockwise. It is sent the value 63 (3FH) if it turns to the

left and 65 (41H) if it turns to the right.

e- CC-LEVEL LED. The value sent in the action from 0 to 127

will tell how many LEDs are to be turned ON at the vu-meter.

At the before last column on the table you can find in the

compressed way the values that each action can attain. There

are DJ Software's where it is not necessary know note values

or control values because this software "read" them

automatically. That is called the "Learn mode" where by

touching a control it assigns its note to a certain function

selected by the user.

At other software you have to wright manually the values or for

the LEDs at any software you have to do the writing because

there is no Lear mode for exiting MIDI messages (i.e. LEDs).

Therefore we recommend you try understanding the meaning

and workings of the table QUARK MIDI MAP.

Following, we explain the columns of the MIDI MAP:

FUNCTION: here find the name of the control of QUARK as

seen on its printing.

MIDI CODE: indicates if the message is a Control Note (9) or

Control Change (B).

CHANNEL+MIDI CODE: appears MIDI CODE values with the

channel (minus 1) used to send the message. Forward in this

manual we explain the MIDI channels used at QUARK.

FUNCTION CODE: at this column we have the value of the

note.

ACTION: here we have the action value. The different values

that can attain are explained at parts a) and e).

Note: the MIDI MAP is presented in hexadecimal base >

NOTE or CC. To assign physical control to software functions

you need to translate the MIDI MAP into decimal base.

Following, we explain have to find out this equivalence HEX-

DEC:

0H 1H 2H 3H 4H 5H 6H 7H 8H 9H AH BH CH DH EH FH

0H 0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240

1H 1 17 33 49 65 81 97 113 129 145 161 177 193 209 225 241

2H 2 18 34 50 66 82 98 114 130 146 162 178 194 210 226 242

3H 3 19 35 51 67 83 99 115 131 147 163 179 195 211 227 243

4H 4 20 36 52 68 84 100 116 132 148 164 180 196 212 228 244

5H 5 21 37 53 69 85 101 117 133 149 165 181 197 213 229 245

6H 6 22 38 54 70 86 102 118 134 150 166 182 198 214 230 246

7H 7 23 39 55 71 87 103 119 135 151 167 183 199 215 231 247

8H 8 24 40 56 72 88 104 120 136 152 168 184 200 216 232 248

9H 9 25 41 57 73 89 105 121 137 153 169 185 201 217 233 249

AH 10 26 42 58 74 90 106 122 138 154 170 186 202 218 234 250

BH 11 27 43 59 75 91 107 123 139 155 171 187 203 219 235 251

CH 12 28 44 60 76 92 108 124 140 156 172 188 204 220 236 252

DH 13 29 45 61 77 93 109 125 141 157 173 189 205 221 237 253

EH 14 30 46 62 78 94 110 126 142 158 174 190 206 222 238 254

FH 15 31 47 63 79 95 111 127 143 159 175 191 207 223 239 255

To translate a Hexadecimal base number into a Decimal base

we have to:

- find the column that has the number that appears at the left.

- find the row that has the letter that accompanies the number.

- the convergence of row and column is the equivalent DEC

number.

Inversely to translate an DEC base number into a Hex base we

have to:

- find the number at the table. Its column is the first hex digit,

the second hex digit is it row.

E.g. Play control MIDI address is 34. Find the DEC

equivalence at the Hexa-Dec table: Column 3 / Row 4 it is

decimal number 52.

Some softwares require not only know the decimal value but

also the corresponding note (for control change the decimal

number is enough). We can perform the Note-Decimal number

equivalence using the following table:

Octave #

-1

12 13 14 15 16 17 18 19 20 21 22

24 25 26 27 28 29 30 31 32 33 34

36 37 38 39 40 41 42 43 44 45 46

48 49 50 51 52 53 54 55 56 57 58

60 61 62 63 64 65 66 67 68 69 70

72 73 74 75 76 77 78 79 80 81 82

84 85 86 87 88 89 90 91 92 93 94

96 97 98 99 100 101 102 103 104 105 106

108 109 110 111 112 113 114 115 116 117 118

120 121 122 123 124 125 126 127

To find the note associated to a decimal number just take the

column where the number is as the note and the row is the

octave.

Following

the

corresponding note to Play button is E3.

As seen at FUCTION CODE column of the MIDI table, each of

the controls of QUARK can send two different messages upon

the state of the Shift button. Remember we can permanently

engage Shift.

QUARK can be divided is 5 parts and the controls that fall in

each of these parts are sent through a different MIDI channel.

The central part of the controller has the controls to be sent

through channel 5.

There are two areas that are not dependent upon Deck

selection. These areas are devised to control effects and

Note Numbers

G G#

example

presented

before

107

119

the