I tested three clocks for a friend and some people could not hear a difference. I was wondering if you guys can hear the difference in different clocks, if infact there is any audible difference. The clocks were: lucid gen-x6 lucid ad9624 internal clock m-audio delta 1010 internal clock. I recorded a part of the demo of my roland jv1010 into the lucidad9624 into logic audio. the mp3 is here: 4.9 megs. http://126.96.36.199:8080/downloads/testerslogic/clock_test.mp3 the 21 megabyte wav file is here: to save the wav, right click on the next link and save target as (remove the mp3 at the end of it) http://188.8.131.52:8080/downloads/testerslogic/clock_test.wav.mp3 If nobody can pick out the genx6 then I will have to consider selling the genx-6 and buying a tube mic since it means that the difference or improvement is negligible.