I am holding off updating my SQ5 because as yet it is not possible to control mono matrices 4 to 6 over midi and this is what I shall be doing with my SQ Rack when it arrives.
If there are problems with midi a command availability, the simple answer is to use more than one (actually 2 because of DAW control) MIDI channel, as is done in AHM, which I also own.
Until the MIDI is up dated, I am running 2 iPads one for me on V1.5 and one for various clients on V1.6