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1MA, 2MA, 3MA, 4MA - Map motor to axis
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Axes must be input as numbers, with X=0, Y=1, Z=2, A=3, B=4 and C=5. 
As you might expect, mapping motor 1 to X will cause X movement to drive motor 1. 
The example below is a way to run a dual-Y gantry such  as a 4 motor Shapeoko setup.
Movement in Y will drive both motor2 and motor4.

 1MA = 0     Maps motor 1 to the X axis
 2MA = 1     Maps motor 2 to the Y axis
 3MA = 2     Maps motor 3 to the Z axis
 4MA = 1     Maps motor 4 to the Y axis
