Krupa was famous for his dramatic crescendos. The method includes long, page-long rolls that go from ppp to fff and back. These are brutal exercises for a PDF—you will need serious discipline to practice them correctly without a teacher.
The PDF cannot play the exercises for you. Use a metronome app (set to a swing feel if possible). Record a video of yourself playing the first five exercises. Compare your dynamics to what is written. Krupa wanted contrast—loud rimshots vs. soft center hits. Gene Krupa Drum Method Pdf
Modern drummers take the hi-hat for granted. Krupa’s method dedicates 10 pages to the low-boy (the predecessor to the hi-hat). He shows you how to play accents by pressing the foot at specific moments—a technique that defines the "Krupa sound." Krupa was famous for his dramatic crescendos