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The best and simplest interface I know of is the one by roli, found in http://www.geocities.com/scubadiver_roli/english.html
it's easy to build, cheap and works very well.
I have made a dozen or so of them so far, and all my users seem happy. Along the way I have actually made some improvments to the basic setup. first of all, I have made an easy to make layour for Veroboard - using it should save you the need to make a spesial-purpuse board or about half the welding time.
I have made a pdf version for the layout, and I will attach it here. you print it our, cut one of the small circut diagrams, and place on the top part of the Veroboard (the side without the lines). with a pin you make holes in the paper whereever a componant needs to go through, and then you put them in place and weld. very easy. note that all diodes face upword, and that you actually need an extreemly small (7holes by 14 lines) piece of Veroboard.
I will attach some pictures of the board as well.
I built my own as well from roli's information. But it looks to me like those that jamiei makes would be best route unless you just like tinkering with things. Great price on what looks like a solid product.