Certain Patch and Effects parameters can be modified in real time by controllers, adding an additional amount of expressiveness to a performance. These controllers include aftertouch (key pressure), modulation, foot pedal, and a special type called 'System Controllers.' System Controllers allow you to globally assign a MIDI controller to one of two System Controller locations. For example, the XP-60/80 contains many Patches that respond to aftertouch.
Let's say you are using a remote keyboard that transmits modulation but does not transmit aftertouch. Because most of these Patches are programmed to respond to aftertouch as a System Controller, you can reassign modulation as a System Controller, in place of aftertouch, and use it to control the Patches in the XP-60/80. More.
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