Hi Josh, very simply (assuming you know the basics of MainStage), open PT as a stand alone instrument.
On the mac, go to utilities folder under the apps, and open audio midi set up, open the midi studio view and it should give you some icons for midi devices. Double click the IAC Driver icon, then tick the 'online' box.
Now in MainStage create a new channel strip - when you do it will ask what kind of strip - Audio, instrument, external instrument or aux? Select external instrument. On the top box of the channel strip (Midi output) should be a drop down menu, and will be a list of connected midi devices that will control this instrument, it will now include the IAC driver, select this.
In PT, go to preferences, under devices, 'deselect' the midi keyboard you use, and select the IAC driver instead. Now what should be happening is that your keyboard plays MainStage, and MainStage sends a virtual midi cable out to PT. This seems a great solution for PT and Kontakt which has much higher CPU usage when used inside of MainStage, however I can't get the sustain pedal and volume pedal to not be in a midi feedback loop - that's my problem at the mo - if I can suss that out - happy days. Would be interested to know if yours is OK.
Richard
