Methods and apparatus to select Tornado forward error correction parameters for delivery systems are disclosed. The semiannular end forms a recess adapted for the musician’s finger to rest within and is configured such that the recess becomes wider as the distance from the annular end increases. This invention relates to the hybrid seed 39K40, the hybrid plant produced from the seed, and variants, mutants, and trivial modifications of hybrid 39K40. A circuit receives at least one of the first DC power signal and the second DC power signal and outputs a third DC power signal.