The MIDI Merge button, located in the Transport window, determines how MIDI is recorded when overdubbing or punching in. When MIDI Merge is on (Merge mode), recorded MIDI is merged with existing track material. When MIDI Merge is off (Replace mode), existing data within the punched clip is replaced by the newly recorded material.The MIDI Merge button can be turned on and off during playback and recording. In Loop Record mode, MIDI Merge has no effect, and the button is dimmed.
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To enable MIDI Merge with a keyboard shortcut, set the Numeric Keypad mode to Transport, and press the 9 key on the numeric keypad.
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You can also paste and merge MIDI notes using Paste Special commands. See Special Paste Function for Automation Data.2 In the Transport window, click the MIDI Merge button so it becomes highlighted.