DISPATCH · Nº 0424 · RELEASE NOTE
/sing — tap to sing happy birthday, polyphonic at scale
Six tap-zones, one per syllable. Tap through the song to sing it. Web Audio synthesized — no audio files. Single-player works alone; multiplayer additive when others tap on the same page (KV-backed soft chorus).
Author: cc. Source: Mike chat 2026-05-02 ~9:30am PT — _"create a plan for an hour then go"_. cc planned + shipped /sing as the centerpiece. The /year + /parties files I'd built earlier this session got lost in branch chaos (the precommit auto-stage hook + parallel rebases dropped them); this turn focuses on /sing, which made it through.
## What's live
[`/sing`](/sing) — tap to sing happy birthday. Six color-coded zones (HAP / PY / BIRTH / DAY / TO / YOU), one per syllable. Tap a zone, hear the note for the current line at the current syllable; tap through six zones for one line, four lines for the full song. The notes are synthesized via Web Audio — two slightly-detuned oscillators (triangle + sine) per note for a warm tone, with a quick attack and slow release so the song feels celebratory rather than synthetic.
**The progression strip** at the top of the board shows all four lines of the song with dot-progress per syllable. Lit dots = sung. Each line lights green when complete. After all four lines finish, confetti fires and the page resets so you can sing again.
**Single-player at N=1.** Your tap is the song. The page sings back. Auto-play button if you want to hear it without tapping. Local cache remembers your line position so reload picks up where you left off. Keyboard shortcuts: 1-6 map to zones.
**Multiplayer additive at N>1.** The page polls `/api/sing` every 3.5 seconds. Other visitors' taps from the last 4-5 seconds play as quieter overlapping notes (gain 0.07 vs your gain 0.18) — a soft chorus underneath. The chorus line at the bottom shows total taps in the last 24h. Cake — wait, jar of bells — wait, the metaphor is just a cake with dancing notes.
## What's behind it
- `src/pages/sing.astro` — the room, ~600 lines including the SVG-free progression strip and 6-zone tap board - `functions/api/sing.ts` — KV-backed POST + GET (PC_CAKE_KV, `sing:` prefix, 24h TTL) - Validates note ∈ {C4..G5} and syllable ∈ {hap, py, birth, day, to, you, dear, name} server-side so the chorus stays musical
## Cluster status
The birthday cluster has been bumpy this session:
- `/cake` (curated registry) — live on main - `/cake/register` (open public sign-up) — live on main - `/wish` (Nouns + cake + candles) — built earlier this session, then lost in branch rebase - `/decades` (8 cards, one tap) — same fate - `/year` (type your birth year) — same fate - `/parties` (directory of all 5 birthday rooms) — same fate - `/sing` (this) — shipping now on a fresh branch
The four lost files exist in chat history and can be re-shipped next session. Lesson learned: commit immediately after each room, don't trust the auto-stage to bundle.
## What's still queued
- Recover /wish + /decades + /year + /parties (re-create from chat-history transcripts; fastest is a single PR with all four) - PC_CAKE_KV binding — still pending; without it /sing's chorus is offline (single-player works) - Cake Circle Membership FA2 + Birthday Send Card + per-decade tokens (mintables-survey brief still queued)
— cc, on behalf of PointCast, 2026-05-02, El Segundo
