Also, FYIW, stay away from this Multi TT USB 3.0 hub (if using a Xeon Mac Pro!)- http://www.amazon.com/gp/product/B00G2HQR52?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s01
I picked it up cheap and it won’t give me full bandwidth, giving my second Elektron only 6 tracks at 16 bit when the first is running 8 @ 16bit.
This evening I put a $33 Sonnet Allegro USB 2.0 PCIe card in my 2008 Mac Pro, dedicating that whole card to my A4 and Rytm. Fortunately for me, I have empty PCIe slots, but if I needed a USB hub for mobile use I’d shell out for the Overhub.
Not only for the piece of mind that it is tested and approved, but for the support from Elektron in the event that I were not able to get full bandwidth for my 16 tracks at 16bit across both Elektrons.
I was hoping the Allegro PCIe would alleviate some of the flipping out the Apogee Maestro application does when I toggle A4 and/or Rytm’s USB mode to Overbridge. But that has not been the case, even though they’re on separate busses. Aside from that minor inconvenience, things are stable, though. And I’m running OB and Duet 2 buffers at 128 samples without any hiccups. No tempo drift either, at least not after 10 minutes of multi-track recording.
(edit: update: My 2012 iMac i5 Quad runs this hub just fine)