Greetings,

I think it is not possible to get audio from Mainstage into Jack on any recent macOS.  Ableton does support Jack though.

It looks like using ReWire, Mainstage has to be the "host" and Ableton the "device".  This is probably not what you want - it basically reduces Ableton to built-in software synths on MIDI tracks.

https://discussions.apple.com/thread/3656229
https://help.ableton.com/hc/en-us/articles/209774305-Using-Live-and-ReWire#rewire-slave
https://support.apple.com/kb/PH13675?locale=en_US&viewlocale=en_US

I'd try Soundflower or Loopback.  *sigh*
----------
Colin


On Sat, Jan 26, 2019 at 5:37 PM LION . <lion.alexpiercy@gmail.com> wrote:
Hey mate.

I have recently installed a copy of JACK onto my MAC and have been trying to use Mainstage 3 in Ableton live. I can't seem to figure out how to do this and was wondering if you could help me out as I just paid apple $47 for there instruments and can't use them.

Kind regards

Alex
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