How did Frankie Knuckles use reel-to-reel tape in his DJ sets?

Frankie Knuckles, the resident DJ at the Chicago club the Warehouse, utilized reel-to-reel tape to create his own custom edits of the cult disco tracks he played during his sets. By physically editing the tape, he was able to extend the grooves of these songs, which helped him maintain the energy of the dance floor throughout the night. This practice of manipulating and extending tracks was a foundational element in the development of house music, which Knuckles further defined by incorporating drum machines into his performances.12