Transliterations are pursuant to IAST (http://en.wikipedia.org/wiki/International_Alphabet_of_Sanskrit_Transliteration)—except “n̐” is used in place of “ṃ” for “ ं ” (anusvara). Go to http://www.omniglot.com/writing/hindi.htm for an expedient reference sheet. All the letters of the alphabet—and most of the additional content—come with audio, and they also come with IPA.