One of the most challenging questions I've been usually asked regarding the noisecode project is: why not use the phonetic alphabet (IPA) instead of the letter (grapheme) alphabet—it would relate to noisecode better, as both would be of aural quality. My answer to such questions is simple: the main idea of noisecode project is to give an audio instantiation to the visual manifestation of a natural language—hence the 26-letter English alphabet.
Apart from that there are several minor reasons:
— phonetic transcription varies according to dialectic details of language (e.g. RP–General American—Cockney. This makes the phonetic alphabet imprecise and not universal;
—English letter alphabet has 26 variables, while English RP phonetic alphabet consists of 24 consonants and 23 vowels (plus 6 additional sounds used in foreign words). I picked the smaller alphabet, as the higher the numer of variables in the code, the more noises needs to be used / overlapped, which leads to decreasing respectively the distinctiveness / clarity of produced sounds.
—letter alphabet is commonly known unlike the phonetic IPA alphabet which is rather a specialist knowledge.