Edit the behavior of relative encoder assignments in Logic Pro for iPad
MIDI controllers use relative encoders to send messages indicating that the current value should be increased by the incoming value when turned clockwise and decreased by the incoming value when turned counterclockwise.
MIDI controllers that use endless rotary encoders as the mechanism for their knobs often support multiple modes of operation. Some controllers support customization so that the endless encoder can transmit either relative change messages or absolute value messages. The Relative (Encoder Knob) option in the MIDI Behavior pop-up menu is designed to accommodate encoders that send relative change messages.
Note: Check the manufacturer’s user guide or editing software for your controller to find out more about the device’s behavior.
MIDI
Format pop-up menu: Most relative encoders use standard MIDI control change (CC) messages; however, because MIDI CC values are only specified to be between 0 and 127, these devices use custom number encodings to represent negative numbers. Logic Pro attempts to detect them automatically for you. If turning an assigned knob on your controller isn’t working as expected, choosing a different format may solve the problem. The choices are:
Two’s Complement: Interprets MIDI value 1 as +1 and MIDI value 127 as –1.
One’s Complement: Interprets MIDI value 1 as +1 and MIDI value 126 as –1.
Sign-Magnitude: Interprets MIDI value 1 as +1 and MIDI value 65 as –1.
Logic Pro
Range fields: Enter minimum and maximum values for the range of the parameter in Logic Pro. The interpreted values of the MIDI CC message adjust the Logic Pro parameter in steps over the range.
Use Global Resolution switch and Global Resolution field: See Resolution for relative controls.
Trigger: Moving the encoder triggers the keyboard shortcut. This setting is available when you assign a MIDI device’s encoder to a keyboard shortcut that toggles on and off, such as play or count-in.
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