TEMPO
BPM to Milliseconds
Quarter
1/8 dotted
1/16 Hz
Tempo Control
BPM
20 · Slow400 · Fast
Space
Detect BPM from Audio
Drop an audio file here
WAV, AIFF, MP3, FLAC · analysed on your device, nothing is uploaded
Detected tempo
—BPM
Confidence
Subdivision Matrix
Straight = 60000 / BPM × 4 × A/B · Dotted × 1.5 · Triplet × 2/3 · click a value to copy
RHYTHM
Euclidean Rhythms
Pattern
Step
Cycle
Pattern Wheel
Pattern Controls
Steps (n)
Pulses (k)
Rotation
STEP LENGTH
E(k, n) spreads k hits as evenly as possible across n steps · Tresillo = E(3,8) · Bembé = E(7,12)
SPACE
Reverb & Delay Times
Bar
Beat
Pre 1/64
Tempo Control
BPM
20 · Slow400 · Fast
Space
Reverb Times
Custom Space
TOTAL LENGTH
bars
PRE-DELAY NOTE
of a bar
Pre-delay
Decay
Total
Delay Quick Picks
Slapback: 60–120 ms, not tempo-synced · dotted echoes groove against the grid
bar = 240000 / BPM · pre-delay = bar / N · decay = total − pre-delay · click a value to copy
PITCH
Note Frequencies
A4
C4
A3
Concert Pitch
A4 tuning · Hz
400 Hz480 Hz
Frequency Matrix
f = A4 × 2^((n − 69) / 12) · C4 = middle C · A4 highlighted · click a value to copy
TEMPERAMENT
Octave Divisions
Scale
Step
Step ratio
Tuning Lab
Reference · Hz
Divisions per octave
Scale Steps · click to audition
f(k) = f₀ × 2^(k/N) · step = 1200/N ¢ · equal intervals are equal ratios, not equal Hz · click a row to hear it
OVERTONES
Harmonic Series
f₀
3×
5×
Fundamental
Spectrum · click a bar to toggle & audition
Bar height = 1/n (sawtooth amplitude) · cents show the drift from 12-TET: green = in tune, amber = noticeable, red = far off the grid · right-click a bar to copy its Hz
fₙ = n × f₀ · 4:5:6 = major triad · 7× lands 31¢ flat of the grid — the “blue” seventh
HARMONY
Circle of Fifths
Key
Signature
Relative
Key Wheel
Key Details
SCALE
DIATONIC CHORDS · click to play & add · right-click to copy
Relative
Dominant
Subdominant
Progression Player
Clockwise = +1♯ (dominant) · Counter-clockwise = +1♭ (subdominant) · Inner ring = relative minor