How it works
A 600 BPM metronome clicks where, by Wikipedia's Speedcore article, a form of electronic music changes names: songs are usually classed as speedcore from around 300 BPM up to 600, it says, and often called splittercore from 600 to 1,000.
Read the full guide
Start
Tap the pad, or press Space, and 600 starts. At this speed both dots on the pad stay lit for as long as the click runs. The next tap stops it.
Change the tempo
Tap the number under the pad and type a whole tempo, or press minus and plus. Type 300 for half the speed. Twice 600 is out of reach: the field stops at 1000.
Questions and answers
What comes after 600 BPM in speedcore?
Splittercore, as far as 1,000, then extratone from 1,000 upward, by Wikipedia's Speedcore article. At the slow end it mentions a looser lower bound of 240, fitted to earlier tracks. Wikipedia flags the article for unreliable sources, so the borders are the article's own.
How many sixteenth notes fit in a second at 600 BPM?
Forty, by our sum, each 25 ms long. An eighth note is 50 ms, a dotted eighth 75 ms and one note of a triplet 33.3 ms.
What tempo word covers 600 BPM?
Prestissimo, for want of a faster one. A Japanese dial pictured in German Wikipedia's Tempo article prints it from 208 upward, and Wikipedia's own list from 200, each as an approximate figure. The most common wind-up scale ends at 208, 392 short of this page.
Why can't I hear the metronome?
A ring switch set to silent, a volume turned right down, or Bluetooth carrying the sound to another device: on a phone it is usually one of those. The pad still shows the click is running, both dots lit until the next tap.