Phone Filter on 'In the Flesh?': How Bob Ezrin Made Roger Waters Sound Like a Public Address System

When Pink Floyd recorded The Wall, producer Bob Ezrin wanted the vocals on “In the Flesh?” to sound like they were coming over a cheap loudspeaker at a rally—something between a stadium PA and a telephone. He didn’t just EQ the track; he sent Roger Waters’ vocal through an actual telephone line to get that thin, nasal midrange.

Ezrin had the vocal signal routed from the studio console into a telephone interface, then back into the board. That single pass through the phone network’s limited frequency range (around 300–3400 Hz) stripped away the lows and highs, leaving the harsh, compressed bark that suits the character’s authoritarian sneer. It’s one of those production tricks that’s both dead simple and impossible to fake convincingly with standard EQ.

The effect appears only on the verses and the “Are there any queers in the theatre?” line—the rest of the vocal stays wide and clean, so the switch hits you like a door slamming shut. Ezrin later said he got the idea from old war movies where generals shout over field telephones.