Sounds: synthesized sound set and a debug sound board

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/sfx/sound_bank.dart

@@ -0,0 +1,130 @@
+import 'sfx.dart';
+import 'synth.dart';
+
+// The app's sound set, all in D major pentatonic so any two that overlap
+// still agree. Rising = someone arrives / gets ready, falling = leaves /
+// unready; bells for people, soft sines for the player, plucks for ticks.
+// Everything is quiet (-16 dBFS peaks or lower) and short.
+
+// Pitches, in semitones from A4.
+const _d4 = -7, _e4 = -5, _a4 = 0;
+const _d5 = 5, _e5 = 7, _fs5 = 9, _a5 = 12, _b5 = 14;
+const _d6 = 17, _e6 = 19, _fs6 = 21, _a6 = 24;
+
+double _p(int s) => semi(s);
+
+/// The ready chime's second note climbs with how many are ready (1st, 2nd…).
+const _readyLadder = [_fs5, _a5, _b5, _d6, _e6, _fs6];
+
+SoundSpec readySound(int readyIndex) {
+  final top = _readyLadder[(readyIndex - 1).clamp(0, _readyLadder.length - 1)];
+  return SoundSpec([
+    Note(0, _p(_d5), 0.35, gain: 0.8),
+    Note(0.075, _p(top), 0.55),
+  ]);
+}
+
+SoundSpec soundFor(SfxKind kind, {int readyIndex = 1}) => switch (kind) {
+      SfxKind.ready => readySound(readyIndex),
+      SfxKind.unready => SoundSpec([
+          Note(0, _p(_a5), 0.3, gain: 0.8),
+          Note(0.08, _p(_e5), 0.45, gain: 0.7),
+        ], cutoff: 4200, peakDb: -19),
+      SfxKind.forceReady => SoundSpec([
+          Note(0, _p(_d5), 0.35, gain: 0.7),
+          Note(0.06, _p(_fs5), 0.35, gain: 0.8),
+          Note(0.12, _p(_a5), 0.6),
+        ]),
+      SfxKind.forceUnready => SoundSpec([
+          Note(0, _p(_a5), 0.3, gain: 0.8),
+          Note(0.06, _p(_fs5), 0.3, gain: 0.7),
+          Note(0.12, _p(_d5), 0.5, gain: 0.7),
+        ], cutoff: 4200, peakDb: -19),
+      SfxKind.forcePlay => SoundSpec([
+          Note(0, _p(_d5), 0.7, gain: 0.6, voice: Voice.soft),
+          Note(0, _p(_a5), 0.7, gain: 0.5, voice: Voice.soft),
+          Note(0.12, _p(_d6), 0.8),
+        ]),
+      SfxKind.forceHold => SoundSpec([
+          Note(0, _p(_a4), 0.35, voice: Voice.soft),
+          Note(0.1, _p(_d4), 0.55, voice: Voice.soft),
+        ], cutoff: 3000, peakDb: -18),
+      SfxKind.kick => SoundSpec([
+          Note(0, _p(_e4), 0.4, voice: Voice.soft, to: _p(_d4 - 2)),
+          Note(0.14, _p(_d4 - 5), 0.6, voice: Voice.soft, gain: 0.8),
+        ], cutoff: 1800, peakDb: -19),
+      SfxKind.join => SoundSpec([
+          Note(0, _p(_d5), 0.3, gain: 0.7),
+          Note(0.07, _p(_e5), 0.3, gain: 0.75),
+          Note(0.14, _p(_a5), 0.6),
+        ]),
+      SfxKind.leave => SoundSpec([
+          Note(0, _p(_a5), 0.28, gain: 0.8),
+          Note(0.08, _p(_e5), 0.28, gain: 0.7),
+          Note(0.16, _p(_d5), 0.5, gain: 0.6),
+        ], cutoff: 3800, peakDb: -20),
+      SfxKind.stale => SoundSpec([
+          Note(0, _p(_fs5), 0.6, voice: Voice.soft, wobble: 0.25),
+        ], cutoff: 3500, peakDb: -21),
+      SfxKind.swap => SoundSpec([
+          Note(0, _p(_d5), 0.6, voice: Voice.soft, gain: 0.6),
+          Note(0.05, _p(_a5), 0.3, gain: 0.5),
+          Note(0.1, _p(_d6), 0.3, gain: 0.5),
+          Note(0.15, _p(_fs6), 0.5, gain: 0.45),
+        ], cutoff: 6000, peakDb: -18),
+      SfxKind.seek => const SoundSpec([
+          Note(0, 987.77, 0.06, voice: Voice.pluck),
+        ], cutoff: 3500, peakDb: -26, room: 0),
+      SfxKind.pause => SoundSpec([
+          Note(0, _p(_a4), 0.28, voice: Voice.soft, to: _p(_e4)),
+        ], cutoff: 3000, peakDb: -21, room: 0.08),
+      SfxKind.resume => SoundSpec([
+          Note(0, _p(_a4), 0.28, voice: Voice.soft, to: _p(_d5)),
+        ], cutoff: 3500, peakDb: -21, room: 0.08),
+      SfxKind.chat => SoundSpec([
+          Note(0, _p(_b5), 0.18, gain: 0.7),
+          Note(0.055, _p(_e6), 0.3),
+        ], cutoff: 5500, peakDb: -19, room: 0.1),
+      SfxKind.warn => SoundSpec([
+          Note(0, _p(_fs5), 0.25, voice: Voice.soft),
+          Note(0.22, _p(_fs5), 0.25, voice: Voice.soft, gain: 0.85),
+          Note(0.44, _p(_d5), 0.45, voice: Voice.soft, gain: 0.8),
+        ], cutoff: 3800, peakDb: -18),
+    };
+
+/// Sounds the app has no event for yet (proposals, shown in the demo).
+enum ExtraSound { start, finished, lost, back, image, mention }
+
+SoundSpec extraSound(ExtraSound s) => switch (s) {
+      ExtraSound.start => SoundSpec([
+          Note(0, _p(_d5), 0.9, voice: Voice.soft, gain: 0.5),
+          Note(0.04, _p(_fs5), 0.9, voice: Voice.soft, gain: 0.45),
+          Note(0.08, _p(_a5), 0.9, voice: Voice.soft, gain: 0.45),
+          Note(0.12, _p(_d6), 0.9, gain: 0.6),
+        ], cutoff: 5000, peakDb: -18, room: 0.2),
+      ExtraSound.finished => SoundSpec([
+          Note(0, _p(_a5), 0.5, gain: 0.8),
+          Note(0.16, _p(_fs5), 0.5, gain: 0.75),
+          Note(0.32, _p(_d5), 1.1, gain: 0.8),
+          Note(0.32, _p(_a4), 1.1, voice: Voice.soft, gain: 0.4),
+        ], cutoff: 4500, peakDb: -18, room: 0.22),
+      ExtraSound.lost => SoundSpec([
+          Note(0, _p(_e4), 0.35, voice: Voice.soft),
+          Note(0.18, _p(_d4), 0.6, voice: Voice.soft),
+        ], cutoff: 2500, peakDb: -18),
+      ExtraSound.back => SoundSpec([
+          Note(0, _p(_d4 + 12), 0.3, voice: Voice.soft),
+          Note(0.12, _p(_a4), 0.5, voice: Voice.soft),
+          Note(0.12, _p(_d5), 0.5, gain: 0.5),
+        ], cutoff: 4000, peakDb: -18),
+      ExtraSound.image => SoundSpec([
+          Note(0, _p(_e6), 0.12, voice: Voice.pluck, gain: 0.6),
+          Note(0.05, _p(_b5), 0.18, gain: 0.7),
+          Note(0.1, _p(_a6), 0.35, gain: 0.6),
+        ], cutoff: 6000, peakDb: -20, room: 0.1),
+      ExtraSound.mention => SoundSpec([
+          Note(0, _p(_d6), 0.25),
+          Note(0.09, _p(_a5), 0.25, gain: 0.8),
+          Note(0.18, _p(_d6), 0.45),
+        ], cutoff: 6000, peakDb: -17),
+    };