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Neal Potsma dissertation.
“The La Voz Corporation was set up as a means to appear not to have a complete monopoly on the reed market. They also tried to lure customers that were not happy with Rico reeds. The company produced a reed with the name La Voz, but it was the same exact reed as a Rico Orange Box.110 Rico color sorted the cane for La Voz reeds, but they did not playtest it. The only other difference between these two reeds was the strength grading. Roy J. Maier (and Rico Orange box) used strengths 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, and 5, a total of nine strengths. La Voz strengths are soft, medium-soft, medium, medium-hard, and hard, a total of five. The reed’s design is the same, but cane density determines the strength. The Roy J. Maier reeds would have closer tolerances in a single box, as they encompassed a smaller range of resistance in the reed.111 The company first introduced this reed in 1948 after only ten years of production of reeds under the Roy J. Maier branding. It was not widely known at the time that Rico even made La Voz reeds, much less that they were the same exact reeds as the Roy J. Maier cuts.”