I managed to find this relating to a similar device, the US-224
well similar model number and possibly shares some of the same usb hardware, clearly they are different products.
http://alsa.opensrc.org/Tascam_US-224hopefully theres enough similarity there to help you.
but this is alot of guessing, as without the device its very difficult to comment further.
most of the forums seem to suggest that tascam products are bricks under linux, so it may be easier
and cheaper to find something that does support linux.
this is something ive always tried to communicate when going Linux, don't try to make Linux work with your hardware,
buy hardware that works with linux.
you would not buy some cheap windows printer, or webcam then expect it to work under macosx would you.
this site looks quite promising for advise
http://www.penguinproducer.com/Blog/201 ... -consider/regards peter