KeyRig 25 User Guide | 17 |
MIDI Messages In-Depth
Program & Bank Changes
When the MIDI standard was first established, it enabled the user to access only 128 different sounds using program change messages
The language MIDI uses to communicate between �������� | �������� | ������� | |
musical instruments only allows for program change |
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commands |
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programs (127 programs + program “0” = 128 |
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programs total). Because of inherent limitations |
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of the MIDI communication protocol, the number | ���������� | ����������� | |
of directly accessible programs (using program |
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change messages) cannot easily be expanded |
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beyond 128. Thus, a system of banks, with 128 |
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sounds in each, has been created that enables | ���������� | ����������� | |
manufacturers to overcome the |
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limit. |
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128 Banks with 128 sounds in each bank is the |
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basic principle used to expand the number of |
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accessible sounds. However, to avoid reaching the |
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new limit of the resulting 16,384 possible sounds |
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(128 banks x 128 programs) accessible using a |
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bank change combined with a program change, |
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another layer of banks was added. The result is a | ���������� | ����������� | |
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system of 128 banks that can contain 128 sub- |
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banks in each of them, which, in turn, can contain ���������� | |||
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128 sounds (programs) within them. |
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Bank change messages are useful when calling |
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up sounds from a large library that may exist in a |
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particular sound module or software synth. For | ������������ | ||
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example devices that are built with Roland’s GS |
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specification or Yamaha’s XG specification require |
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you to specify a bank change in order to access the |
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extra voices and effects that these devices provide. |
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MIDI CC 0 is the bank select MSB (Most Significant |
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Byte) message. This MIDI message is | ���������� | ����������� | |
and can be used to select any of 128 banks. This | |||
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message can be used in conjunction with MIDI CC | ���������� | ||
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32 which is bank select LSB (Least Significant |
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Byte): a separate | ���������� | ����������� | |
selection of any of another 128 |
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combination of Bank MSB and LSB messages | ������������ | ��������� | |
gives a | ��������� | ||
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possible 16,384 banks. Each bank can in turn |
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contain 128 possible sounds selected via a separate |
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program change MIDI message. This enables a user to theoretically recall over two million programs directly, using only MIDI commands. However, most devices only use a few different banks, and allow you to access them with either a Bank LSB message or a Bank MSB message. Please consult your synthesizer’s or software’s documentation for more information on which type of bank change messages they can process.”