Oh loud
Ach-Laut ( ) is the name for the voiceless velar or uvular fricative , like the German ch after the back vowels a, o, u. By the International Phonetic Alphabet it is [ x ] (velar) or [ χ ] shown (uvular).
In addition to German, where it is pronounced velar or uvular, the Ach sound occurs in the following Indo-European languages : Greek , Dutch , Polish , Russian , Spanish , Slovak , Czech and Persian .
In German, the Ach sound is allophone to the I sound . That means: Both sounds complement each other; the choice between the two sounds depends on which vowel precedes it. It is different in Greek and Russian: There the pronunciation depends on the sound that follows.