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http://www.cbtricks.com/miscellaneous/accessories/sound_toys/magnum/trb_1/graphics/trb_1_inst_2006.pdf


I dunno if that link helps.

I read it thru and it does tell how to set it up for 'optimal performance'.  Some reviews have said that it will be a bit touchy to get it right.  I've never put one of these in, as all of the radios that I use already have them in it.  The Magnum radio I have has a really clean echo; and I expect that your TRB-1 will be of the same quality as well.


Keep us posted with your work!