I suspect that you could be right.
See this sticky thread for oones that we know work well with Audacity: Sound Card Reviews
The Behringer UCA-202 is generally considered to be a good one by some of the other elves on this forum - I considered it strongly but bought the Edirol UA-1EX instead as I wanted the gain control and the digital input (the UCA-202 has no gain control).
WC