For anyone curious… i worked it all out (mainstage is not straightforward with midi control at all, complicated program, overly so).
and have mainstage brilliantly working with cubase including tempo slave… Have it set to 2 cores only, one for alchemy and one for a couple retro synths.
I wish i could set cubase to 6 out of 8 (on mac can’t be done).
But if anyone needs any help with MS and Cubase just drop me a PM any time, i’ll be happy to provide a blank template or help.
I just use a single IAC bus with it at present cause i will never need more than 16 midi channels of mainstage… and what i am in fact going to do, when i get my new imac pro, is keep my current imac, use one of my myriad of spare interfaces, and literally dedicated that imac as a hardware synth to run mainstage for alchemy, retro synth and kontakt,. perhaps also audio spillage drum synth which does not have a VST version.
I’ll set my interface on the imac to 64 buffer, and record it to audio like any normal midi synth at project mixdown time.
Really excited about this as Alchemy is AWESOME.
Mainstage was well worth the tiny cost of entry… and i highly recommend it for anyone who wants those tasty logic plugins!
It also means, in a sense, i do not need to give up the logic tape delay which i miss more than anything, because i can put it on my lead synth as long as i use mainstage and any au plugin in it!
Also, i have worked out how to control alchemy pad moprhing via cubase automaton with simple cc implementation. Great stuff!
Oh and final thing, yes, Cubase is the master of course… i notice beat clock via the iac bus fluctuates with cubase… for example if i set mainstage to slave and cubase to 120 bpm, you can see mainstage’s metronome “wiggling”, so midi jitter, and fluctuating from 119.8 to 120.2
But interestingly, if i use the exact same scenario with pro tools as beat clock master, there is no jitter and mainstage never strays from tempo… this confirms the thought for me that pro tools has always had the tightest beat clock timing out of all my DAWs.