Top Bar

The top bar is where you start and stop playback, control the camera, and reach the Settings panel and the main menu. Transport controls sit on the left, view and menu controls on the right.

Layout

Left to right:

Control	What it does
Play / Pause	Start or pause playback. Shift-click or long-press for loop playback.
Stop	Stop playback, return the playhead to the start, and disarm loop mode.
Volume	Master volume, silent to full.
Reset View	Recentre the camera on the BaseNote, keeping the zoom.
Playhead Tracking	Toggle. Locks the camera's horizontal axis and keeps the playhead centred.
Settings (gear)	Open or close the Settings panel.
"+"	Open or close the main menu.

Two controls that are not up here

The lock is a floating padlock at the bottom-right of the viewport — see Locking. The scale controls are the small dot at the bottom-left — see Scale controls.

Transport

Play / Pause

One button, four states:

Icon	State
Play triangle	Stopped or paused.
Red pause bars	Playing.
Red dashes orbiting a figure-8	Playing on a loop.
Red dashes orbiting while stopped	Loop is armed for the next play — this is what a seek during a loop leaves behind.

Playback starts from wherever the playhead is. Click empty canvas to move the playhead first.

Loop playback

Shift-click the Play button, or long-press it (hold for 500 ms without moving), to toggle loop playback. The button's tooltip changes to Loop playback — shift-click or long-press to exit while it is armed.

• Arming loop from a stopped or paused transport also starts playback — the gesture means "play this on a loop".
• Disarming flips the icon back straight away, but the audio plays the current pass out to its end and stops there rather than cutting off.
• Pausing a loop disarms it — that is why the button shows the ordinary play triangle. The next play is a single pass; re-arm with the gesture if you want the loop back.
• Stop disarms the loop outright too — it is the escape hatch out of the mode.
• Loop mode is not saved. It is gone on reload.

Stop

Halts playback, resets the playhead to the beginning, and disarms loop mode.

Volume

A slider from silent to full. It applies while you drag and is saved when you release.

It is the same number as Settings → Audio → Master volume, which shows it as a percentage — silence is 0%, full is 100%. Move either one and the other follows.

The signal runs through a real audio graph with a limiter enabled by default, and reverb enabled by default. See Audio and Effects.

View controls

Reset View

Recentres the camera on the BaseNote. Zoom is untouched — this is a pan, not a zoom reset. Use it when panning has left you looking at empty space.

While Playhead Tracking is on, this button is greyed out and its tooltip reads Reset disabled while tracking.

Playhead Tracking

Off by default, and never saved — it is off again after a reload.

When on, the camera locks its horizontal axis: the playhead stays pinned to the centre of the viewport and the music scrolls past it. You cannot pan sideways while tracking is on, and zooming re-centres on the middle of the viewport instead of the pointer. Vertical panning still works.

See Playhead Tracking.

Settings

The gear opens the Settings panel. It is the only way in — there is no "Settings…" entry in the menu.

The gear rotates on hover and turns red while the panel is open. The panel is floating, draggable by its header, and not modal: leave it open and keep composing. It has five tabs — Appearance, Arrows, Audio, Library, Scale — and every change takes effect immediately; there is no OK or Apply button.

Press Escape with focus inside the panel to close it. See Settings.

The "+" menu

The "+" button opens the main menu. Its two bars rotate together into a single red minus while the menu is open. (There is no hamburger icon anywhere in the app.)

Entry	What it does
Undo	Undo the last change. Disabled when there is nothing to undo.
Redo	Redo the last undone change.
Reorder Module	Reindex the notes by start time. Asks for confirmation first: "Reorder the current module? This will reindex notes. Proceed?"
Save Module	Download the current module as module.json.
Load Module ▾	Open a submenu.
↳ Load Module from file…	Pick a .json module from disk.
↳ Reset Default Module	Load the built-in default module. Asks for confirmation; the reset can be undone from history.

WARNING

Loading a module replaces the workspace. Save first if you want to keep what you have.

Undo and redo are also on Ctrl/Cmd + Z and Ctrl/Cmd + Y, and there is a second pair of undo/redo buttons in the module bar toolbar. All of them drive the same history.

Footer

At the bottom of the menu:

Link	Goes to
Documentation	docs.rmt.world
Donate	Stripe
License (MIT)	The licence page, which also lists third-party notices

Plus the copyright line, © 2026 Cyril Monkewitz.

Panels stack, they do not fight

The "+" menu, the note widget, the group widget and the Settings panel are peers in one z-order stack, and whichever one you last opened or touched comes to the front. Clicking one of them never closes another, and never clears your note selection.

The note widget and the group widget are the one exception: they are two presentations of the same selection, so growing it to two or more notes swaps the note widget for the group widget, and shrinking it back to one swaps them the other way.

Clicking anywhere else — the canvas, the bars — closes the "+" menu.

Tips

1. Ctrl/Cmd + Z is faster than opening the menu.
2. The current module is kept in browser storage and comes back when you reload — but a file saved with Save Module is the only copy that survives clearing your browser data.
3. Turn tracking on before playing a long piece.
4. Lock the canvas before you demo — the padlock is at the bottom-right, not up here. See Locking.

Next

• Settings — the five tabs behind the gear
• Transport Controls — playback in full
• Workspace — the canvas everything else acts on