Most controls don't allow you to change the Feed value, while the machine is running, only the feed overide (percentage) on the control panel.
The way I make edits to g-code is, make my edit to the g-code (program not running).
Re-Save the program (after edits).
Re-Load the program so that the edits take, in the control.
Run the program.
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NOTE:
Most controls look way ahead of the actual line of code it is running.
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