I would say a reasonable amount. I have another set up where I have managed to have a Virus, MD, A4, MnM and Maschine all hooked up to an iMac in (almost) perfect harmony where I could use the Virus keyboard to control notes on everything else.
The problem is that that setup is in storage at the moment until I finish DIY on the studio and was wanting to play around with some sequenced melodic elements on top of a set of sampled core parts on the Octatrack. I’m using a MacBook running Mavericks (rather than my usual iMac).
In terms of MIDI interfaces I have a a Focusrite Saffire PRO-24 and TM-1.
I have set the Octatrack MIDI up to send on individual channels (double tapping the Playback menu). In terms of specific menus:
Control
Default settings
Sync
Transpore: Recv
Clock: Recv
Progam CH: Null
Ch AUTO: Null
Recv: Null
Channels
AUTO Ch: 11
Trig CH: Default
MIDI Sequencer:
CC Direct Connect: Enabled
Please let me know if you need any further info.