mikeb33, The only way it can improve asynchronous USB is by isolating computer noise, that might affect D/A converter clock. In asynchronous USB scheme DAC operates on internal clock and takes data from the buffer memory. The only thing USB does is to keep this buffer filled. It is remotely possible that USB transfers can be affected by electrical noise, since in most cases there is no "resend", but it is rare and has nothing to do with stability of the clock.
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