You will need to write the m6start macro to suit your tool changer and how it operates. It may be similar to the one posted earlier or it may be totally different, it all depends on your changer. My macro is totally different to that one I posted as my lathe has two turrets but they are mainly controlled in a PLC external to Mach so all my macro needs to do is switch on outputs to start the PLC and then wait for the PLC to tell it that the tool is in position.
If you can say how your changer will operate I am sure someone will be able to help you out.
Well 1:20am here so sleep time for me
Hood