Roland VM-C7100 Owner's Manual page 301

MIDI Implementation
4. MIDI Joystick Support
A joystick connected via MIDI can be used to operate the surround function.
All MIDI channels of the following control changes are received, and will affect the
surround parameters of the channel that is selected in the screen.
The VM-C7200/C7100 does not transmit this message.
Status Second
BnH mmH
n = MIDI channel number (ignored)
mm = parameter number:
ll = parameter value:
Changes will be detected, and treated as the amount of change from the current value.
The Function of Parameter Numbers
Parameter Function
5DH (93) the level of the front left channel
5EH (94) the level of the front right channel
5FH (95) the level of the front center channel
76H (118) the level of the rear left channel
77H (119) the level of the rear right channel
In addition, the following format of exclusive messages can be received to control the Pan
and Depth surround parameters of the channel that is selected in the screen.
THe VM-C7200/C7100 does not transmit this message.
Byte Description
F0H Status of System Exclusive Message
43H Manufacturer ID
1xH "x" is ignored
3DH 3D (fixed value)
00H 00 (fixed value)
11H 11 (fixed value)
48H 48 (fixed value)
0xh the upper 1 bit of X-Coordinates (Pan)
0xl the lower 4 bit of X-Coordinates (Pan)
0yh the upper 1 bit of Y-Coordinates (Depth)
0yl the lower 4 bit of X-Coordinates (Depth)
F7H End of Exclusive
The X coordinate (Pan) and Y coordinate (Depth) values will be from 00H (0) to 1FH (31),
and the value is received as two MIDI bytes, each with 4 bits of data.
Far left when X=0, center when X=16, and far right when X=31.
Closest when Y=0, middle when Y=16, and furthest away when Y=31.
5. Appendices
Decimal and Hexadecimal table
(Hexadecimal number is shown with H.)
In MIDI documentation, data values and addresses/sizes of system exclusive messages etc.
are expressed as hexadecimal values for each 7 bits. The following table shows how these
correspond to decimal numbers.
+——————+——————++——————+——————++——————+——————++——————+——————+
| Dec. | Hex. || Dec. | Hex. || Dec. | Hex. || Dec. | Hex. |
+——————+——————++——————+——————++——————+——————++——————+——————+
| 0 | 00H || 32 | 20H ||
| 1 | 01H || 33 | 21H ||
| 2 | 02H || 34 | 22H ||
| 3 | 03H || 35 | 23H ||
| 4 | 04H || 36 | 24H ||
| 5 | 05H || 37 | 25H ||
| 6 | 06H || 38 | 26H ||
| 7 | 07H || 39 | 27H ||
| 8 | 08H || 40 | 28H ||
| 9 | 09H || 41 | 29H ||
| 10 | 0AH || 42 | 2AH ||
| 11 | 0BH || 43 | 2BH ||
| 12 | 0CH || 44 | 2CH ||
| 13 | 0DH || 45 | 2DH ||
| 14 | 0EH || 46 | 2EH ||
| 15 | 0FH || 47 | 2FH ||
| 16 | 10H || 48 | 30H ||
| 17 | 11H || 49 | 31H ||
| 18 | 12H || 50 | 32H ||
| 19 | 13H || 51 | 33H ||
| 20 | 14H || 52 | 34H ||
| 21 | 15H || 53 | 35H ||
| 22 | 16H || 54 | 36H ||
| 23 | 17H || 55 | 37H ||
300
Third
llH
5DH, 5EH, 5FH, 76H, 77H
00H - 7FH (0 - 127)
64 | 40H || 96 | 60H |
65 | 41H || 97 | 61H |
66 | 42H || 98 | 62H |
67 | 43H || 99 | 63H |
68 | 44H || 100 | 64H |
69 | 45H || 101 | 65H |
70 | 46H || 102 | 66H |
71 | 47H || 103 | 67H |
72 | 48H || 104 | 68H |
73 | 49H || 105 | 69H |
74 | 4AH || 106 | 6AH |
75 | 4BH || 107 | 6BH |
76 | 4CH || 108 | 6CH |
77 | 4DH || 109 | 6DH |
78 | 4EH || 110 | 6EH |
79 | 4FH || 111 | 6FH |
80 | 50H || 112 | 70H |
81 | 51H || 113 | 71H |
82 | 52H || 114 | 72H |
83 | 53H || 115 | 73H |
84 | 54H || 116 | 74H |
85 | 55H || 117 | 75H |
86 | 56H || 118 | 76H |
87 | 57H || 119 | 77H |
| 24 | 18H || 56 | 38H ||
| 25 | 19H || 57 | 39H ||
| 26 | 1AH || 58 | 3AH ||
| 27 | 1BH || 59 | 3BH ||
| 28 | 1CH || 60 | 3CH ||
| 29 | 1DH || 61 | 3DH ||
| 30 | 1EH || 62 | 3EH ||
| 31 | 1FH || 63 | 3FH ||
+——————+——————++——————+——————++——————+——————++——————+——————+
* Decimal values such as MIDI channel, bank select, and program change are listed as one
(1) greater than the values given in the above table.
* A 7-bit byte can express data in the range of 128 steps. For data where greater precision
is required, we must use two or more bytes. For example, two hexadecimal numbers aa
bbH expressing two 7-bit bytes would indicate a value of aa x 128 + bb.
* In the case of values which have a ± sign, 00H = -64, 40H = ±0, and 7FH = +63, so that the
decimal expression would be 64 less than the value given in the above chart. In the case
of two types, 00 00H = -8192, 40 00H = ±0, and 7F 7FH = +8191.
* Data marked "nibbled" is expressed in hexadecimal in 4-bit units. A value expressed as a
2-byte nibble 0a 0bH has the value of a x 16 + b.
<Ex.1> What is 5AH in decimal system?
5AH = 90 according to the above table.
<Ex.2>What in decimal system is 12034H in hexadecimal of every 7 bit?
12H = 18, 34H = 52 according to the above table. So 18 x 128 + 52 = 2356.
<Ex.3> What in decimal system is 0A 03 09 0D in nibble system?
0AH = 10, 03H = 3, 09H = 9, 0DH = 13 according to the table.
So ((10 x 16 + 3) x 16 + 9) x 16 + 13 = 41885.
<Ex. 4> What in nibble system is 1258 in decimal system?
_____
16)1258
16) 78 ... 10
16) 4 ... 14
0 ... 4
0 = 00H, 4 = 04H, 14 = 0EH, 10 = 0AH according to the table. So it is 00 04 0E 0AH.
Example of system exclusive message and Checksum
calculation
On Roland system exclusive message (DT1), checksum is added at the end of transmitted
data (in front of F7) to check the message is received correctly. Value of checksum is defined
by address and data (or size) of the system exclusive message to be transmitted.
How to calculate checksum (Hexadecimal number is shown with H.)
Checksum is a value which lower 7 bit of the sum of address, size and checksum itself turns
to be 0. If the address of the system exclusive message to be transmitted is aa bb ccH and
data or size is dd ee ffH,
aa + bb + cc + dd + ee + ff = sum
sum / 128 = quotient and odd
When odd is 0, 0 = checksum
When odd is other than 0, 128 - odd = checksum
88 | 58H || 120 | 78H |
89 | 59H || 121 | 79H |
90 | 5AH || 122 | 7AH |
91 | 5BH || 123 | 7BH |
92 | 5CH || 124 | 7CH |
93 | 5DH || 125 | 7DH |
94 | 5EH || 126 | 7EH |
95 | 5FH || 127 | 7FH |