28
MIDI IMPLEMENTATION
CATEGORY
CC
DATA RANGE
DESCRIPTION
Bypass All
62
0-63
bypass
64-127
active
Tuning Reference
101 RPN MSB
00
100 RPN LSB
01
6,38 Data Entry
0-3FFFh
MSB
LSB
00
00h
-100 cents
40
00h
0 cents
7F
7Fh
+99.99 cents
The table below shows how to set the MSB and LSB to achieve
various cents offsets as per the standard MIDI specification, and how they
translate into the frequency in Hz (VoiceOne specifies Tuner Reference in Hz).
Hz Equivalent MSB LSB Cents away from A440
~415
00h 00h
-100.00
~427
20h 00h
- 50.00
~432
30h 00h
- 30.00
440
40h 00h
0.00
~448
53h 00h
+30.00
~453
60h 00h
+50.00
~466
7Fh 7Fh
+99.99
The MSB sets an offset range between 0 = -100 and 127 = +99 cents, 64
equating to 0 cents.
The LSB tacks on a fine amount setting between 0 = 0.00 and 127 = 0.99 cents.
To convert from a cents offset to an equivalent Hz as indicated by Tuner
Ref under the Utility menu, use the following formula:
Hz = 440 * (2 ^ (cents / 1200))
For software that only allows you to specify RPN data as one "combined
value" between 0 and 16383, here is a formula that you can use:
"combined value" = MSB*128 + LSB
For example, if you want 453 Hz as your tuning reference, you would choose
MSB = 60 and LSB = 0, which using the above formula gives you a
"combined value" of 7680.
Please see the NRPN section for the complete list of NRPN controllable parameters.
Pitch Bend
Input Pitch
Note On
C2-C6
Continuous Pitch Bend
range of +/- 2 semi-tones
Note Off
Pitch Bend
0-3FFFh
Содержание VoiceOne
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