USB 3 to USB 2 and Thunderbolt

BOUGHT A TOP OF THE LINE MAC BOOK AIR WITH i7 8GIG 500SSD ETC.
Now then, the air only has USB 3 which would normally be fine, however, there are few if no external soundcards that work backwards compatible with USB 3. the air i bought is to be used for DJ work but now it's being used as £1600 door wedge until the matter can be resolved.
So can I?  :-
A - Turn USB 3 into USB 2? (seems mad to go backwards)
B - Buy a thunderbolt lead or some gizmo that changes 3 to 2 (happy to buy extra leads)
C - Anyone know of an audio interface that will work with USB 3 - no real cheap stuff (we do have a very cheap card that does work but reliabilty for live performances is a worry)
Any help either way would be great, using Virtual DJ Pro (fully licenced) for music but when the sound card (Numark DJIO) is connected the music just clicks and doesnt play the track.plug in a cheap card and it runs but we need a multi channel card, and the system works if we use the internal speakers but using the headphone outlet into pro audio mixers etc is not a good idea or gives PFL etc.
The rest of my electronic life is all apple IPhone, Ipad, Ipad mini, went all out and made the switch and went macbook and the wheels fell off big time, need to get off PC and on to mac.
help please..............

Have you tried any of these soundcards designed for 2.0?
The 3.0 port is categorically designed to be comoatible with all 2.0 devices. The port itself will adapt to the usage parameters of the device.
But if you really want to downgrade, then simply plug any 2.0 hub into a MBA 3.0 port. The ports on the hub will be 2.0.

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