Clicked

Solution

The sounds in the audio are from the rhythm game Rhythm Doctor, but this is not required for this puzzle.

The audio contains 8 measures of 8 beats. The metronome click is different at the start of each measure (every 8 beats).

Furthermore, the flavor text (“massive”) hints at Supermassive Black Hole. We can interpret the clap sounds as taps of the mouse and the longer, sliding sound as holding the mouse over a number of ticks. (The medium-length sound is to be ignored.)

Interpreting these actions as letters according to Supermassive Black Hole (one letter per measure) yields the answer.

BARB WIRE