v0.6.0 — Sequencer editor + JX-faithful editing rules

This release turns the Sequences sub-tab’s piano-roll visualizer into a full editor. Insert notes / rests / ties; drag-to-shift pitch; marquee-select multiple notes per column; save edits as new library entries. Every encoding path the editor can produce was empirically validated end-to-end on a real JX-3P (tape-load → playback → tape- record → JP-decode → visual match).

What’s improved

Sequencer editor (new)

Single-page-view editing across the whole roll:

Click an empty area of the roll → toggle a small insert tooltip with NOTE / REST / TIE buttons (note-glyph ♪, JX-tie-arc ⌣, eighth- rest SVG — same icons as the hover labels). Click again on any empty area → tip dismisses. Anchors near the cursor. Replaces the prior Ctrl+click / right-click trigger — plain click is more discoverable.
Drag a note vertically → pitch-shift with live preview. The rect follows the cursor; on drop, the underlying voice mutates and a preview tone plays at the new pitch.
Marquee drag on an empty area → column-constrained multi-select. Notes highlight live as the drag covers their pitch range (no dashed rectangle — the notes themselves indicate selection).
Group pitch-drag → if the mousedown lands on a selected note in a group of >1, the drag moves every group member by the same Δpitch.
Keyboard Delete → removes the selected note(s).
Playhead is grabbable directly (cursor: ew-resize) for scrub.
Save-as-new-copy → the original library sequence is snapshotted on first edit. SAVE writes the edits as a new “edited” library entry (numbered) and restores the original from the snapshot. Nav-away with unsaved edits prompts Save / Discard / Cancel.
Undo / redo → standard Cmd+Z / Cmd+Shift+Z undoes any editor mutation (insert, delete, pitch-drag, group drag). Multi-note Delete via marquee selection is batched into a single undo entry. Reuses the app-wide undo stack (50 entries deep) already used by patch-list and bucket reorders. If undo brings the sequence back to its pre-edit state, the SAVE button automatically goes away.

JX-faithful insert rules (pitfall #16 closure)

The editor’s NOTE / REST / TIE buttons respect the JX-3P’s actual encoding constraints, so JP-edited sequences load and play correctly on real hardware:

REST ties EVERY new attack from the previous column into this step. A 5-voice chord followed by REST produces 5 tied voices in the next column, not 1.
TIE writes canonical {tied, attack} voice pairs per pitch when N≤3 fits the JX’s 6-voice budget; falls back to fresh-attacks-only for N≥4 (matches the JX firmware’s observed polyphonic-TIE fallback).
NOTE is disabled when the column has any tied voice — the JX itself can’t record a step that mixes a note attack with a rest/tie continuation, so neither does the editor. The disabled button shows a tooltip explaining why.

End-to-end validated on real JX-3P hardware: edits round-tripped through tape-load → JX playback → tape-record → JP decode with column- for-column match, across all four encoding paths (single + chord NOTE, polyphonic REST, canonical TIE, polyphonic-TIE fallback).

Custom Bank reorder: drag-to-last-slot fixed

Dragging a C-bucket or D-bucket entry onto the LAST slot (C16 / D16) was a silent no-op — the bucket drop handler was missing the top-half / bottom-half cursor convention that the three other reorder paths already use. Now drop on the bottom half of a row to “insert after” that row; the last slot is finally reachable as a destination. A 2px green bar appears above or below the target row to show direction.

Write flow: Cancel actually exits now

Pressing Cancel on the “Save this new patch to ?" confirm modal used to dismiss the modal but leave the app in Write mode — clicking any other slot re-popped the modal, which felt like a loop. Cancel, Escape, and click-outside on the overlay all now exit Write mode cleanly (banner disappears, Write button un-lights).

The “X of N pages populated” text is back in the visualizer header (removed earlier in the cycle on the theory that the dimmed page- button row at the bottom communicated the same info). The explicit count is faster to read.

Internal changes

New pure-logic module renderer/seq-insert-rules.js holding the NOTE / REST / TIE insert rules + eligibility math. Same source of truth for the tooltip’s button-enabled state AND the underlying voice-array mutators. 33 new unit tests pin every JX-derived property (canonical-vs-fallback TIE branch at N=4, polyphonic REST 6-voice cap, NOTE-vs-tied gate, page-boundary lookups).
New module renderer/synth-preview.js (triangle-wave note preview with envelope ramps; 5 tests including A4 = 440 Hz round-trip).
showConfirmModal gained an optional onCancel callback so callers can clean up dependent state when the modal is dismissed without an explicit Confirm/Tertiary choice. (Used to fix the Write-flow loop.)
app.js shrank by 77 lines on the seq-insert-rules extraction.
Test count: 127 → 199, all passing.

Known issues

Nav-away guard direction asymmetry (intermittent). Observed once during QA: navigating from the sequence editor (Library tab) to the active banks (C/D) with an unsaved sequence did NOT pop the “Sequence has been edited” modal, but navigating back from the banks to the Library did. Both directions are wired through the same guardSeqNav helper, so the asymmetry should be impossible — but we couldn’t reproduce it after the first occurrence. Not a data-loss bug (dirty tracking and SAVE/REVERT still work as labeled). If you hit it, capture the state and we’ll instrument with logging in a follow-up.

Install

Download the DMG below. macOS will flag it as “damaged” — that’s a Gatekeeper warning, not real damage. To open: right-click the app → Open → Open. (Apple Developer ID notarization is on the roadmap for a future release.)

System requirement: macOS 12+ on Apple Silicon (arm64). Intel Macs not currently supported.

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