Ronald (I hope you don't mind that I address you rather informally),
I took a different approach on learning how to pronounce the Lojban "x".
I happen to have studied the Persian (Farsi) alphabet, and it has the
character "خ" or "khe" which seems to be similar if not exact to the
Lojban "x". A sound recording of "خ" can be found here:
http://easypersian.com/W4/khe_4.mp3
(Reminds me a bit of Hebrew)
Even if you do already have that confidently figured out, perhaps it
will help in confirmation?
-Termy