While I couldn't find any official free audio download resources, here are a few alternatives:
Hueber provides some general downloads for their textbooks on their official site, but full Kursbuch audio for Tangram Aktuell is usually restricted to paid versions unless specifically provided as a supplement for teachers. Tangram Aktuell 1 Lektion 1-4 Audio Download Free Extra
: Basic sentence structure, self-introductions, and daily vocabulary. While I couldn't find any official free audio