How it works
Metronome 155 stops one beat short of Vivace. Wikipedia's list of tempo markings runs Allegro and Allegro vivace up to 156 and starts Vivace there, so 155 is the last whole tempo before it. Very rough figures, the list warns.
Read the full guide
Start
Tap the pad, or press Space, and 155 runs level: no click is raised and the two dots simply alternate. Tap the pad again for silence.
Change the tempo
To change it, tap the number under the pad and type, or step with minus and plus. For 155 in 3/4, type it into the 3/4 metronome, which raises the first click of every three. The most common wind-up scale in Wikipedia's Metronome article moves in eights here: 152, then 160.
Questions and answers
Does any metronome call 155 vivace?
One of three pictured in German Wikipedia's Tempo article: a 21st-century Japanese dial prints Vivace over 152 to 176, where Wikipedia's English list waits until 156. Its German dial (120 to 168) and French dial (152 to 180) say Allegro. Approximate bands, it warns.
Was drum and bass ever as slow as 155 BPM?
It had sped up to there by 1993. Wikipedia's Drum and bass article puts the earliest forms at around 130 and the style at around 155 to 165 by 1993, 155 being the low figure. From around 1996 it gives mostly 170 to 180.
How long is each note at 155 BPM?
Short: a sixteenth note lasts 96.8 ms, under a tenth of a second. An eighth note lasts 193.5 ms, a dotted eighth 290.3 ms and one note of an eighth-note triplet 129 ms. Each is our own division of the beat printed under the pad.
Why can't I hear the metronome?
A muted phone is the likely cause. Try the ring switch, the volume buttons and the Bluetooth list, in that order, in case a speaker elsewhere has the click. At 155 the pad's two dots still alternate with the sound off.