Answering unasked questions: There is /b/ in Italian. Eg: bene but there is no /b:/ in my data. But there is gemminate /b/, e.g.: abbonato (the b in phonetic is wrote twice). Is there a multilingal phonetic system? Yes, the name is The International Phonetic Alphabet (IPA). Is there any system more details than that? It is depending on the research group/person itself, it may not widely acceptable accross resea hide