The top control bar
BPM and tempo: Type a tempo, drag the long slider, or use the ±1, ±5, and ±10 buttons. Tap Tap Tempo several times at your desired speed. The word below BPM is the musical name for that tempo.
Note value and meter: Half note gives 2/2, quarter note 4/4, and eighth note 8/8. The staff and drum-machine guides show 2, 4, or 8 pulses, and the default drum grid has 16, 32, or 64 steps. Reducing the grid drops added hits between the new positions.
Play / Stop: Start the pattern or silence playback. Fullscreen expands the app; press it again to return.
Swing: 50% gives evenly spaced eighth-note subdivisions. Move right to delay the & and create a long–short feel.
Count-in: Choose how many quiet preparation bars play before your pattern. Set 0 to start directly.
BPM change / every: Automatically raise or lower the tempo by the chosen amount after that many bars. For example, +2 every 4 bars increases BPM by 2 after each group of four. Set BPM change to 0 for a steady tempo.
Measures: Counts completed pattern bars, excluding the count-in. Reset restores the full starting setup described below.
Three volumes on one slider
Drag G to set ghost-note volume, N for normal notes, and A for accents. Each dot moves independently along the same 0–100% track: left is quieter, right is louder. G sits below the line, N on it, and A above it so you can select each one even when their levels match.
The dots can pass each other; you choose the balance. The handle's tooltip shows its level. You can also focus a slider with Tab and adjust it with the arrow keys.
These settings apply to that limb's notes in all three views, including its linked drum-machine hits. Normal numbered beats and normal subdivisions use the same sound and level. Changing a volume keeps each note's ghost, normal, or accent type.
Four types of beat
2Normal
^2Accent
(2)Ghost
2Off
Click any numbered or small subdivision circle to cycle Normal → Accent → Ghost → Off → Normal. Each circle is independent. Off silences only that note and keeps its place in the rhythm.
The large count shows the whole beat group and marks the current syllable. Eighth notes use 1 &; triplets use 1 T L; sixteenths use 1 E & A.
Drum-machine edits update Hits / bar and Subdiv. to represent the full pattern. For example, 64 steps become 16 hits with 16th-note subdivisions: 1 E & A, 2 E & A, and so on. Silent steps remain off, and each note keeps its timing and type. Added instruments have their own purple pattern cards.
Tempo and the shared bar
All limbs share a 4/4 bar. Hit counts, subdivisions, tempo and beat-unit edits apply at the next bar. Swing applies to 8th-note subdivisions.
Use the note-value selector beside BPM to choose Half note (2/2), Quarter note (4/4), or Eighth note (8/8). Each bar contains one whole note. At the same BPM, changing this unit changes the bar's duration. While stopped, edits apply immediately.
Reset stops playback and restores 4/4 at 60 BPM with four hits per limb: left-hand snare, right-hand open hi-hat, left-foot closed hi-hat, and right-foot bass kick. It also clears added patterns and restores the volume and timing settings.
Keyboard shortcuts
Space: Play/Stop | T: Tap Tempo | ↑↓: BPM ±1 | Shift+↑↓: ±10 | F: Fullscreen
The same four note types on the staff
The caret marks an accent; parentheses mark a ghost note. Off becomes a rest at the same time position. Instrument names and colors identify the limbs; each sound has its own percussion position and notehead.
The staff shows enabled limbs. Muted notes stay visible but fade. The moving line follows the sound; numbered guides and the tempo symbol follow the selected BPM unit.
Connected notes and uneven counts
Beams show written note values. 7:8 means seven notes in the time normally occupied by eight of that same value. 11:8 works the same way. These examples use eighth notes, so each group fills the shared whole-note bar.
Four pad states
1Off
2Normal
3Accent
4Ghost
Click a pad to cycle Off → Normal → Accent → Ghost → Off. Brightness identifies the note type. For linked limb rows, the G / N / A handles adjust sound levels separately. Blue is shown here; each linked row uses its limb's color.
Linked notes and additional instruments
Drum-machine edits update the note buttons, notation, Hits / bar, and Subdiv. together. A 64-step row uses 16 numbered beats, each with E, &, and A subdivisions. Existing notes keep their timing, and blank positions stay off. You can edit a note from either set of buttons.
An instrument without a limb gets its own purple pattern card and staff part when you add notes. Change a limb's hit count or subdivision to set a new regular rhythm. Off keeps a note's position available as a silent step.
Muting or disabling a limb also silences its linked added hits. Independent purple patterns keep their own notes.
The full bar stays visible
Default grids use 16 steps with half-note BPM, 32 with quarter-note BPM, or 64 with eighth-note BPM. Switching to a smaller grid removes added hits between its positions, keeping the remaining hits in place. Odd rhythms use a matching grid and can have a different step count.
The moving line shows the same point in the bar for every row. Off leaves a silent slot; it never shortens the rhythm.
