[sdevino]

Keep in mind that if you have a firewire interface, it can control the and manage the audio flow over the firewirebus. In other words the computer's clocking and data management are controlled by the FW interface actually the computer just caches the audio samples to the FW interface and it manages all the clocking).

So with CoreAudio FW interfaces it makes sense to use the USB2 for your external audio storage and retrieval. This frees up the FW capacity for multiple audio interfaces running at high sample rates and eliminates leaves data caching to the CPU and drive.

Those of us using high end FW devices with other non PT DAWs in the past have learned this. Now you can do the same thing with PT9.