If you are going to use SyncWrite for AX-12, you can also use the example code I wrote for XL-320s at this post:
There are two programming differences between XL-320 and AX-12 which are:
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The Present Position Address on the AX-12A is 36, while it is 37 on the XL-320.
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The AX-12A does not have a P Gain Parameter.
Make sure you read and understand the Control Tables of XL-320 and AX-12