sokuon may also be used to approximate a non-native sound: Bach is written バッハ (Bahha); Mach as マッハ (Mahha). Both katakana and hiragana usually spell native...

preceding vowel, if it's not followed by a vowel (e.g. マッハ ma-h-ha "Mach", バッハ Ba-h-ha "Bach", マゾッホ Ma-zo-h-ho "Masoch"); [ç], its allophone occurring only...