First you ask for a real-time voice changer, then for a call recorder. Sus. Even if it’s legal.

Thank you, updating the firmware was the issue. Added this to the Original Post. :-)

As Sonoff doesn’t seem to offer invoices, I’m not sure if it is a ZBDongle-P or -E, but I will check out updating its firmware, good thinking!

Yes, and it was a renowned job up until the late 90s/early 2000s. The job transformed drastically in the early 80s with upcoming new techniques (e.g. phototypesetting, the predecessor to digital typeset).

Without typesetters, a major role in terms of grammar and design checks broke away. This isn’t the only factor, but since early 2000s, typos where everywhere.