Trix variation that you are posting there is a variation that is NOT trix. It was a variation of raff's original trix indicator (also made by raff) that spread through the net (btw: to be truthful, you did not change the original author, so from that point of view, everything is OK)
This is the post where raff posted original trix for the first time
http://www.forex-tsd.com/39832-post5.html and it is the "real" trix (meaning (momentum of EMA(of EMA(of EMA)) Also, the post where raff posted the changed variation of trix
http://www.forex-tsd.com/43842-post13.html
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In the attachment : description of the original trix (may/june 1984)
regards