Playback behavior

These are the shared playback rules that app updates are aligning. They describe the target behavior; they do not mean every current app version or device has completed verification.

Interruptions and returning

Putting the app in the background, locking it, covering the play screen, hiding a web tab, choosing a device or losing audio output pauses song time and the remaining wait. All held inputs, sound and running lights are released. Return to playback by explicitly pressing play. A permission or connection notification alone never starts the song. Playback continues at the next unprocessed command and does not recreate earlier presses. Play, guide and step selections remain. Closing the pack or restarting the app removes the pending resume. Opening an in-screen menu alone does not interrupt playback.

Fingers and chains

Sliding between pads is a saved option, initially off. With it off, a finger holds its first pad until release, even over another pad or a gap. With it on, leaving a pad releases it and entering a pad presses that pad. Fingers are independent. Cancellation, rotation, covering the screen or changing the option releases current inputs; fingers still down do not become new presses automatically.

A chain button changes the chain once when pressed. Pads pressed before that finger releases use the new chain. Releasing or cancelling the chain press does not revert it. Dragging across chain buttons does not select several chains. The manual wormhole cancellation rule in keySound still applies.

The final wait

Auto-play honors its last delay. on 1 1 followed by delay 2000 finishes at song time 2000 ms, then releases auto-play's own held pads. Another finger's press is not released with it. Pausing during that final wait freezes its remaining time. Manual stop or closing the pack cleans up immediately. Finite sounds and animations keep their own existing completion rules; no extra tail time is added.

Starting options and lights

On pack entry and auto-play completion, press feedback is off when the pack has LED animations and on otherwise. A direct choice during playback applies for that interval. Watermark remembers the last explicit choice across restarts, initially on. Opening a pack never raises a volume the user lowered. Mobile system volume stays separate from saved web volume. The web reads the saved value before allowing playback; when absent, its existing level 7 of 7 remains. Equal levels do not promise equal sound pressure.

Turning pack LEDs off discards every active, queued, looping and undelivered animation and clears screen and controller lights. Nothing accumulates while off. Enabling starts only animations from new input. Sound and auto-play continue; press feedback and watermark remain separate options.

Auto-map, backup and restore

Auto-map changes the pack only after an explicit request. It puts a 1000 ms wait before the first press. Consecutive waits before a press form one group, replaced by the length of the last sound pressed before that group. Consecutive presses with no wait remain simultaneous. Chain order and sound queue indices are preserved. Waits after the last press are removed. If a length cannot be read, the original wait stays. Nonnegative milliseconds round to the nearest integer, with halves upward: 400.4 becomes 400, 400.5 becomes 401. Each press has an immediate release, as touch or equivalent same-time on/off.

The new auto-play and its previous version must be saved together before reporting success. A restart preserves both. Restore swaps the current version and the previous backup, so it can be undone too. Another auto-map keeps only the new previous version. Failed or interrupted storage keeps the original and backup and reports failure. The web retains the source archive and stores the result and backup in its browser pack data; opening a disk file does not allow silently overwriting it. Concurrent mapping or restore requests are blocked while saving and playback is stopped for the operation.

Trace

Entering the play screen starts with empty trace and recording off. Numeric display is the default; existing saved numeric, line or dot choices remain. Turning recording off stops only new marks; existing marks stay and enabling continues them. Per-chain order and repeat numbers survive display-style, Pro light and layout changes. Clear empties every chain without changing the recording option. Keep both long-press clear and a separate clear-all entry in the play menu. Closing the pack clears the trace.

Audio admission and failures

The exact integer rules are in Sound files. Structural file inspection, successful decoding, actual output and device memory are different checks. A structural admission pass does not certify identical trimmed duration, successful playback, physical controllers or peak device memory.