Fast Track Pro also features near-zero latency direct hardware monitoring and low-latency ASIO software monitoring, plus an A/B source switch and dual output ...
they would assign the right indices to the interface and the onboard sound card:
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10.11.1-10.11.6; Tested with Avid-qualified Apple computers; Check the Pro Tools Operating System
Products; New Products · USB Audio | Midi Interfaces · Keyboard Controllers · Monitors · Microphones · Accessories · Legacy Products. Support; Support Options ...
I use a Fast Track Pro as my principle sound card in combination with a QuNexus and
Hub_#0003 1/Port_#0001.
well the m ausio fast track pro is a little tricky in linux.
Fast Track C400 driver crashes system FireWire and USB Audio
Soundcards ~200-400 $us. [Tascam]