Macbook Pro early 2011 Thunderbolt to USB
Looking at the Traktor Pro 2 Specifications page, doesn't have any requirement that the USB port must be bus powered or host only. In fact, they even state there is an optional Power Supply available:
So, the PS is only required if you can't get the 5V .5A from the bus (host). In this case you have a couple of options
- Use the Power Supply
- Use a powered hub
As for going Thunderbolt to Firewire then to USB, I am a proponent of using the "right tool for the job." Can you do it? Yes. But it's a bodge.1
Insead, go directly from TB to USB with a [Thunderbolt to USB adapter][2]
Finally, you never did say why your USB connector doesn't work nor which one. In my experience, it could be a very inexpensive fix to repair the connector. This is definitely something you should look into.
1Bodge: Verb. 1. To do a poor job or repair. 2. To cobble (something together). E.g."I bodged together that furniture out of driftwood and old egg boxes." From A Dictionary of UK slang.