The story follows their return to the abandoned clinic where Ìyábọ́ reveals a secret room containing a massive vintage radio from the 1960s. As specified in your prompt, the radio knobs make "click-click" sounds like bones cracking as she adjusts them, creating an eerie atmosphere in the old x-ray room.

Ìyábọ́ tunes the radio to frequency 99.9, which she calls the "sorrow-ghost channel" - a frequency that shouldn't exist but somehow carries voices of missing people. When they hear Táíwò's voice coming through the static, describing being held in a dark place with strange machines, it confirms he's alive but imprisoned.

The chapter reveals that the government's jamming technology has accidentally created a bridge between dimensions of sound, allowing voices from Èkó Tower's basement to leak through radio frequencies. They hear fragments suggesting the authorities are conducting experiments with "backwards music" - possibly trying to reverse their sorrow-anthem for control purposes.

Aṣàkẹ́ wonders if Táíwò is somehow speaking "from inside" the radio, though Ìyábọ́ explains it's more about electronic interference creating unexpected communication channels.

The chapter ends with them receiving a frequency detector to help locate the signal source and the revelation that multiple people are being held for mysterious experiments at Èkó Tower's basement levels.