About this tool
Turn a song's tempo into tempo-synced delay and reverb times right in your browser. Enter the BPM and it returns delay times in milliseconds for whole, half, quarter, eighth, sixteenth and thirty-second notes, each in straight, dotted and triplet feel, plus the matching LFO frequency. Nothing is uploaded; every value is computed locally.
The math starts from the quarter-note length: quarter-note ms = 60000 / BPM. Every other note value scales from there — a whole note is ×4, a half ×2, an eighth ×0.5, a sixteenth ×0.25 and a thirty-second ×0.125. Dotted notes multiply the straight time by 1.5 and triplets by 2/3. The LFO frequency in hertz for any of these is simply 1000 / (delay time in ms).
Use the quarter-note delay for classic rhythmic echoes, a dotted-eighth for the well-known "The Edge" guitar sound, and set a reverb pre-delay to a 1/16 or 1/32 note so the reverb tail sits just behind the beat. At 120 BPM the quarter note is 500 ms and the eighth is 250 ms.