Owner's manual

EXR-5/EXR-3 MIDI Implementation
19
According to the “Parameter Address Map (p.248),” the REVERB LEVEL Address is
40 01 33H, and the parameter value is 0CH. Thus,
Next we calculate the checksum.
40H + 01H + 33H + 0CH=64 + 1 + 51 + 12=128 (sum)
128 (sum) ÷ 128 = 0 (quotient) ... 0 (remainder)
checksum = 128 - 0 (remainder) = 128 = 80H
In this case, however, the checksum value should be 00H, not 80H. You should use
00H if the remainder is 0.
This means that F0 41 10 42 12 40 01 33 0C 00 F7 is the message we transmit.
■ About the Tuning
In MIDI, individual Parts are tuned by sending RPN #1 (Master Fine Tuning) to the
appropriate MIDI channel.
In MIDI, an entire device is tuned by either sending RPN #1 to all MIDI channels being
used, or by sending a System Exclusive MASTER TUNE (address 40 00 00H).
RPN #1 allows tuning to be specified in steps of approximately 0.012 cents (to be pre-
cise, 100/8192 cent), and System Exclusive MASTER TUNE allows tuning in steps of
0.1 cent. One cent is 1/100th of a semitone.
The values of RPN #1 (Master Fine Tuning) and System Exclusive MASTER TUNE are
added together to determine the actual pitch sounded by each Part.
Frequently used tuning values are given in the following table for your reference. Val-
ues are in hexadecimal (decimal in parentheses).
[Example] Setting the tuning of MIDI channel 3 to A4 = 442.0 Hz
Send RPN#1 to MIDI channel 3. From the above table, the value is 45 03H.
● The Scale Tune Feature (address: 40 1x 40)
The scale Tune feature allows you to finely adjust the individual pitch of the notes from
C through B. Though the settings are made while working with one octave, the fine
adjustments will affect all octaves. By making the appropriate Scale Tune settings, you
can obtain a complete variety of tuning methods other than equal temperament. As
examples, three possible types of scale setting are explained below.
❍
Equal Temperament
This method of tuning divides the octave into 12 equal parts. It is currently the most
widely used form of tuning, especially in occidental music. On the EXR-5/EXR-3, the
default settings for the Scale Tune feature produce equal temperament.
❍
Just Temperament (Tonic of C)
The principal triads resound much more beautifully than with equal temperament, but
this benefit can only be obtained in one key. If transposed, the chords tend to become
ambiguous. The example given involves settings for a key in which C is the keynote.
❍
Arabic Scale
By altering the setting for Scale Tune, you can obtain a variety of other tunings suited
for ethnic music. For example, the settings introduced below will set the unit to use the
Arabic Scale.
Example Settings
The values in the table are given in cents. Refer to the explanation of Scale Tuning on
page 18 to convert these values to hexadecimal, and transmit them as Exclusive data.
For example, to set the tune (C-B) of the Part1 Arabic Scale, send the following data:
F0 41 10 42 12 40 11 40 3A 6D 3E 34 0D 38 6B 3C 6F 40 36 0F 76 F70
F0 41 10 42 12 40 01 33 0C ?? F7
(1) (2) (3) (4) (5) address data checksum (6)
(1) Exclusive Status, (2) ID (Roland), (3) Device ID (17),
(4) Model ID (GS), (5) Command ID (DT1), (6) End of Exclusive
Hz at A4 Cents RPN #1 Sys.Ex. 40 00 00
445.0 +19.56 4C 43 ([phone]C 04 (+196)
444.0 +15.67 4A 03 ([phone]D (+157)
443.0 +11.76 47 44 (+ 964) 00 04 07 06 (+118)
442.0 + 7.85 45 03 (+ 643) 00 04 04 0F (+ 79)
441.0 + 3.93 42 42 (+ 322) 00 04 02 07 (+ 39)
440.0 0 40 00 (0) 00 04 00 00 (0)
439.0 - 3.94 3D 3D (- 323) 00 03 0D 09 (- 39)
438.0 - 7.89 3A 7A (- 646) 00 03 0B 01 (- 79)
B2 64 00 MIDI ch.3, lower byte of RPN parameter number: 00H
(B2) 65 01 (MIDI ch.3) upper byte of RPN parameter number: 01H
(B2) 06 45 (MIDI ch.3) upper byte of parameter value: 45H
(B2) 26 03 (MIDI ch.3) lower byte of parameter value: 03H
(B2) 64 7F (MIDI ch.3) lower byte of RPN parameter number: 7FH
(B2) 65 7F (MIDI ch.3) upper byte of RPN parameter number: 7FH
Note name Equal Temperament Just Temperament
(Keytone C)
Arabic Scale
C00-6
C# 0 -8 +45
D 0 +4 -2
D# 0 +16 -12
E 0 -14 -51
F 0 -2 -8
F# 0 -10 +43
G 0 +2 -4
G# 0 +14 +47
A 0 -16 0
A# 0 +14 -10
B 0 -12 -49