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Again, I can't help with calling Focusmax from Voyager, but I can say I have found the Voyager focus routines to be very good. On my SCT I use either the full field averaging focus for larger objects (Similar to SGP but better in my experience) or the "V curve" method which characterises your optics either side of focus and then focuses on a single, centered star and is usually faster than the full field method. On my refractor which produces a much flatter field I use the V curve method exclusively.
Regardless of using Voyager's native focusing routines or external software called from within Voyager, triggering it in normal use (Where you set up a sequence that you either run directly, or call from a dragscript) is as simple as ticking the box in the sequence to have Voyager inject a focus run on starting the sequence and then in another tab, what focus method you want it to use and what other conditions to trigger it (Time, temperature change, number of subs since last focus run etc)
My SCT is very temperature sensitive and the focuser has no temperature sensor so I waste a little time in the night by having it focus every 30 minutes (50 sharp 300 second subs in a winters night being better than 45 sharp ones, 15 OK ones and 5 rubbish ones) and the refractor focuses every 2 degrees temperature change or once every two hours. Even through a NB filter the frac focus run would not cost more than a couple of 600 second subs in a night, RGB focusing takes maybe two minutes each time.
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