OK the slow jog DRO shows a % of your full rapid so if set to 100% it will jog at full rapid, if its set to 50% it will jog at half rapid.
So what you want to do is work out what % of your rapid speed you want each button to be and have that in the VB,
For example if you have 200IPM as your rapid in motor tuning and you want to jog at 20IPM you would set the DRO to 10%, to do that from a VB button you would have the following in the button.
Call SetOEMDRO(3,10)
If you wanted 100IPM in another button it would be
Call SetOEMDRO(3,50)
Hood