In a sound source or synthesizer, the sounds are sometimes divided into several groups. For example, the preset sounds in the XV-5080 are divided into A~H groups, each group has 128 sounds---a group is called a bank.
In the multi-effects, the effect is also divided into several banks, but usually four or five effects are a group.
Why divide the sound or effect into several groups? The reason is very simple, that is, to make the operation of the tone selection more convenient; another reason is the limitation of the MIDI signal.
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