How it works
Metronome 142 sits on the last figure of dubstep's usual range. Wikipedia's Dubstep article puts the genre's tempo nearly always between 132 and 142; the 2007 CBC arts feature it cites describes a steady 138 to 142.
Read the full guide
Start
Tap the pad, or press Space. The clicks at 142 are all alike and two equal dots take turns, so the pad marks no bar. Tap once more and it stops.
Change the tempo
Tap the number under the pad and type a tempo, or use minus and plus. The commonest wind-up scale in Wikipedia's Metronome article has no 142: it moves in sixes here, 138 then 144, so two presses of plus land on a notch.
Questions and answers
Is 142 BPM faster than most dubstep?
By two beats: Wikipedia's Dubstep article puts most releases at 140. Other styles carry on upwards: Wikipedia gives techno 120 to 150 and trance much the same, from 120 or 125, so 142 lies inside both.
Is 71 BPM the half time of 142?
Yes: every second click of 142 is a beat of 71. Wikipedia's Dubstep article describes its own sound example in both numbers: a bass pattern at 142 under sparse drums that imply 71. To hear 71, type it into the field under the pad.
Is 142 BPM allegro or assai?
Allegro in Wikipedia's list of tempo markings (120 to 156, very roughly) and on a German dial pictured in German Wikipedia. A present-day Japanese dial there prints Assai over 138 to 152, only approximately placed. Wikipedia's Tempo article files assai under additional terms: (very) much.
What are eighth and sixteenth notes at 142 BPM in milliseconds?
An eighth note lasts 211.3 ms and a sixteenth 105.6 ms: a half and a quarter of the beat, by our division. A dotted eighth is 316.9 ms, one note of an eighth-note triplet 140.8 ms, and four beats take 1.69 s.
Why can't I hear the metronome?
On a phone, look at the ring switch, then the volume, then whether Bluetooth has handed the click to headphones or a speaker. At 142 the two dots still take turns more than twice a second, sound or no sound.