User:Korn/draft

Which of the features of each variant are considered 'standard' varies depending on time, region and even individual views of the speaker/author. As a general rule, however, speakers of the southern variants may consciously imitate northern speech, but a northern native speaker will not train himself to use a southern form.

Sources:
 * Die Aussprache der Standardsprache in der deutschen Schweiz (Hove)
 * Duden - Das Aussprachewörterbuch (Mangold), section Genormte Lautung
 * Standard Austrian German (Moosmüller, Schmid, Brandstätter)

Note that [ɐ] is a shorthand for an allophonic range of central vowels which assimilate in heighth to the preceding vowel.