Place it at the very end of a clip, after the last exchange has played out, so it closes the scene. Put No No Wait Wait just before it for a back-and-forth, then let this line finish the sequence.
Sobre este sonido
This is a short spoken German phrase, Danke fürs Gespräch, lasting about 2.5 seconds, delivered as a single neat sign-off. It feels wry and final, polite on the surface but clearly finished with the discussion, so it lands as a light, dismissive goodbye rather than a warm thank-you.