tap to the beat, or hit spacebar. a new session starts when you tap again after a pause.
--bpm
or type a bpm:
how the transition math works
half and double time are the cross-genre bridge: a 174 bpm drum and bass track and an 87 bpm hip-hop track share the same kick grid - every other dnb kick lands on the hip-hop beat. the same math pairs 70 bpm trap with 140 bpm dubstep.
the dotted eighth (x3/4) is the subtler pivot: 129 house into 97 material feels related without a big jump, and the pros ride 4/3 (129 to 172) to cross from house into drum and bass.
tempo math is a guide, not a rulebook. phrase alignment and your ears are the final judge.