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Explanation: Perhaps there is a better term, but this is all I can come up with for the time being.
1. Das Selbstfahrerstudio wird von unseren Moderatoren am liebsten benutzt. Der Moderator ist gleichzeitig der Techniker und genau dafür ist das Studio gebaut: Alle wichtigen Geräte sind vom Moderationsplatz aus leicht zu erreichen. Zusätzlich gibt es ein Gastmikrofon. An dem Platz kann auch ggf. ein Co-Moderator sitzen.
2. ... a historical footnote for airing the very first call-in ... Sam Phillips was a one-man studio, doing it all himself ...
Explanation: Thanks to Parrot, I have been led to the following idea:
"It was an odd experience. I was welcomed at Broadcasting House by a team of security guards who searched me for bombs, and one of them then conducted me to a self-operating studio and left me to it. I did my performance and let myself out of the studio, at which point I apparently had the run of Broadcasting House. "