diff --git a/public/dings/README.md b/public/dings/README.md
index 573a78f9..b36e1fb7 100644
--- a/public/dings/README.md
+++ b/public/dings/README.md
@@ -12,6 +12,6 @@ with motif one of `mention`, `dm`, `message`, `invite`; paths are relative to th
 A sender's own clip wins, else the neutral clip, else silence. Without a `manifest.json` the client keeps
 its stock notification sounds; once one exists, a motif with no clip is silent.
 
-The set here is Aqua's v3 (AquaSynth PR #22, staged at minds.gamecult.org/aqua/dings-voices-70a9795),
-Nibu on proposal 1 (static-filter square). Nobody has heard it. The client plays none of it unless the
+The set here is Aqua's v4 (AquaSynth merge 21e83ec, staged at minds.gamecult.org/aqua/dings-voices-dd9be66),
+Nibu on proposal 3 (8 kHz 5-bit smoothed sine) for all four events. Nobody has heard it. The client plays none of it unless the
 client config sets `"dings": { "enabled": true }` (default off, as in `config.json`).
diff --git a/public/dings/senders/aqua/dm.ogg b/public/dings/senders/aqua/dm.ogg
index 0a2b98da..5a235546 100644
Binary files a/public/dings/senders/aqua/dm.ogg and b/public/dings/senders/aqua/dm.ogg differ
diff --git a/public/dings/senders/aqua/invite.ogg b/public/dings/senders/aqua/invite.ogg
index 4f70d214..f349e735 100644
Binary files a/public/dings/senders/aqua/invite.ogg and b/public/dings/senders/aqua/invite.ogg differ
diff --git a/public/dings/senders/aqua/mention.ogg b/public/dings/senders/aqua/mention.ogg
index 1f9c3ffa..67d36911 100644
Binary files a/public/dings/senders/aqua/mention.ogg and b/public/dings/senders/aqua/mention.ogg differ
diff --git a/public/dings/senders/aqua/message.ogg b/public/dings/senders/aqua/message.ogg
index ce68c47a..3704f55a 100644
Binary files a/public/dings/senders/aqua/message.ogg and b/public/dings/senders/aqua/message.ogg differ
diff --git a/public/dings/senders/eureka/dm.ogg b/public/dings/senders/eureka/dm.ogg
index a64c22f6..57024fbe 100644
Binary files a/public/dings/senders/eureka/dm.ogg and b/public/dings/senders/eureka/dm.ogg differ
diff --git a/public/dings/senders/eureka/invite.ogg b/public/dings/senders/eureka/invite.ogg
index 708dd38d..d6a6e328 100644
Binary files a/public/dings/senders/eureka/invite.ogg and b/public/dings/senders/eureka/invite.ogg differ
diff --git a/public/dings/senders/eureka/mention.ogg b/public/dings/senders/eureka/mention.ogg
index 0025d742..c4085fae 100644
Binary files a/public/dings/senders/eureka/mention.ogg and b/public/dings/senders/eureka/mention.ogg differ
diff --git a/public/dings/senders/eureka/message.ogg b/public/dings/senders/eureka/message.ogg
index beb2a203..6cd340ce 100644
Binary files a/public/dings/senders/eureka/message.ogg and b/public/dings/senders/eureka/message.ogg differ
diff --git a/public/dings/senders/heimdall/dm.ogg b/public/dings/senders/heimdall/dm.ogg
index f4844c02..145e8853 100644
Binary files a/public/dings/senders/heimdall/dm.ogg and b/public/dings/senders/heimdall/dm.ogg differ
diff --git a/public/dings/senders/heimdall/invite.ogg b/public/dings/senders/heimdall/invite.ogg
index 6e27e760..98403c21 100644
Binary files a/public/dings/senders/heimdall/invite.ogg and b/public/dings/senders/heimdall/invite.ogg differ
diff --git a/public/dings/senders/heimdall/mention.ogg b/public/dings/senders/heimdall/mention.ogg
index e0064147..5a39a98c 100644
Binary files a/public/dings/senders/heimdall/mention.ogg and b/public/dings/senders/heimdall/mention.ogg differ
diff --git a/public/dings/senders/heimdall/message.ogg b/public/dings/senders/heimdall/message.ogg
index a2bddd92..068e7198 100644
Binary files a/public/dings/senders/heimdall/message.ogg and b/public/dings/senders/heimdall/message.ogg differ
diff --git a/public/dings/senders/kiko/dm.ogg b/public/dings/senders/kiko/dm.ogg
index 8b76726e..7c35b072 100644
Binary files a/public/dings/senders/kiko/dm.ogg and b/public/dings/senders/kiko/dm.ogg differ
diff --git a/public/dings/senders/kiko/invite.ogg b/public/dings/senders/kiko/invite.ogg
index 45d02d52..f8eff1a1 100644
Binary files a/public/dings/senders/kiko/invite.ogg and b/public/dings/senders/kiko/invite.ogg differ
diff --git a/public/dings/senders/kiko/mention.ogg b/public/dings/senders/kiko/mention.ogg
index 388dbbab..12cccf29 100644
Binary files a/public/dings/senders/kiko/mention.ogg and b/public/dings/senders/kiko/mention.ogg differ
diff --git a/public/dings/senders/kiko/message.ogg b/public/dings/senders/kiko/message.ogg
index 8eae8e4e..e0f6e885 100644
Binary files a/public/dings/senders/kiko/message.ogg and b/public/dings/senders/kiko/message.ogg differ
diff --git a/public/dings/senders/libby/dm.ogg b/public/dings/senders/libby/dm.ogg
index 8b580a4b..1316c196 100644
Binary files a/public/dings/senders/libby/dm.ogg and b/public/dings/senders/libby/dm.ogg differ
diff --git a/public/dings/senders/libby/invite.ogg b/public/dings/senders/libby/invite.ogg
index f88e6d28..4b92a0b7 100644
Binary files a/public/dings/senders/libby/invite.ogg and b/public/dings/senders/libby/invite.ogg differ
diff --git a/public/dings/senders/libby/mention.ogg b/public/dings/senders/libby/mention.ogg
index 5f62aa67..f335c2c9 100644
Binary files a/public/dings/senders/libby/mention.ogg and b/public/dings/senders/libby/mention.ogg differ
diff --git a/public/dings/senders/libby/message.ogg b/public/dings/senders/libby/message.ogg
index d923f60b..432f8623 100644
Binary files a/public/dings/senders/libby/message.ogg and b/public/dings/senders/libby/message.ogg differ
diff --git a/public/dings/senders/nibu/dm.ogg b/public/dings/senders/nibu/dm.ogg
index ede0ec45..2965cf53 100644
Binary files a/public/dings/senders/nibu/dm.ogg and b/public/dings/senders/nibu/dm.ogg differ
diff --git a/public/dings/senders/nibu/invite.ogg b/public/dings/senders/nibu/invite.ogg
index 1cd6492a..57e54c47 100644
Binary files a/public/dings/senders/nibu/invite.ogg and b/public/dings/senders/nibu/invite.ogg differ
diff --git a/public/dings/senders/nibu/mention.ogg b/public/dings/senders/nibu/mention.ogg
index 6a065e39..5f6d2dfc 100644
Binary files a/public/dings/senders/nibu/mention.ogg and b/public/dings/senders/nibu/mention.ogg differ
diff --git a/public/dings/senders/nibu/message.ogg b/public/dings/senders/nibu/message.ogg
index c3241582..a9294354 100644
Binary files a/public/dings/senders/nibu/message.ogg and b/public/dings/senders/nibu/message.ogg differ
diff --git a/public/dings/senders/void/dm.ogg b/public/dings/senders/void/dm.ogg
index e169ae98..d09a7a94 100644
Binary files a/public/dings/senders/void/dm.ogg and b/public/dings/senders/void/dm.ogg differ
diff --git a/public/dings/senders/void/invite.ogg b/public/dings/senders/void/invite.ogg
index 0b344456..ed46cbb9 100644
Binary files a/public/dings/senders/void/invite.ogg and b/public/dings/senders/void/invite.ogg differ
diff --git a/public/dings/senders/void/mention.ogg b/public/dings/senders/void/mention.ogg
index 80ec43e3..b6295e00 100644
Binary files a/public/dings/senders/void/mention.ogg and b/public/dings/senders/void/mention.ogg differ
diff --git a/public/dings/senders/void/message.ogg b/public/dings/senders/void/message.ogg
index 5c8fd5c8..da1f0a16 100644
Binary files a/public/dings/senders/void/message.ogg and b/public/dings/senders/void/message.ogg differ
diff --git a/public/dings/senders/weksa/dm.ogg b/public/dings/senders/weksa/dm.ogg
index 3eb3fa88..37b5f990 100644
Binary files a/public/dings/senders/weksa/dm.ogg and b/public/dings/senders/weksa/dm.ogg differ
diff --git a/public/dings/senders/weksa/invite.ogg b/public/dings/senders/weksa/invite.ogg
index b9dd5643..1c401418 100644
Binary files a/public/dings/senders/weksa/invite.ogg and b/public/dings/senders/weksa/invite.ogg differ
diff --git a/public/dings/senders/weksa/mention.ogg b/public/dings/senders/weksa/mention.ogg
index 148a6aca..98fa0f75 100644
Binary files a/public/dings/senders/weksa/mention.ogg and b/public/dings/senders/weksa/mention.ogg differ
diff --git a/public/dings/senders/weksa/message.ogg b/public/dings/senders/weksa/message.ogg
index 2e678ea6..f552996b 100644
Binary files a/public/dings/senders/weksa/message.ogg and b/public/dings/senders/weksa/message.ogg differ
diff --git a/src/app/features/dings/manifest.test.ts b/src/app/features/dings/manifest.test.ts
index 7017669a..0001e685 100644
--- a/src/app/features/dings/manifest.test.ts
+++ b/src/app/features/dings/manifest.test.ts
@@ -4,11 +4,46 @@ import { join } from 'node:path';
 import { describe, expect, it } from 'vitest';
 import { DingManifest, Motif, dingsEnabled, parseManifest, pickDing } from './dings';
 
-// The staged v3 set (Aqua, AquaSynth PR #22). Nobody has heard it; these tests check the manifest
+// The staged v4 set (Aqua, AquaSynth merge 21e83ec, page minds.gamecult.org/aqua/dings-voices-dd9be66). Nobody has heard it; these tests check the manifest
 // against this code, not the sound.
 const DINGS = join(__dirname, '../../../../public/dings');
 const raw = JSON.parse(readFileSync(join(DINGS, 'manifest.json'), 'utf8'));
 const manifest = parseManifest(raw) as DingManifest;
+// sha256 prefixes of the 32 clips as staged by Aqua; Nibu's four are proposals/nibu3 (same samples, own Ogg serial).
+const V4_SHA: Record<string, string> = {
+  'aqua/mention': 'cedb63552008',
+  'aqua/dm': '5b996d01c770',
+  'aqua/message': '8be19ccd505a',
+  'aqua/invite': '462e63687f0b',
+  'eureka/mention': '7afe0bcc90d0',
+  'eureka/dm': '3909d70b0d45',
+  'eureka/message': '0b466cd4b437',
+  'eureka/invite': '837e1bbbdacf',
+  'heimdall/mention': '36051569eb2c',
+  'heimdall/dm': '26ebc4158d51',
+  'heimdall/message': 'c383d6ce3da0',
+  'heimdall/invite': 'fd47e9a97bb2',
+  'kiko/mention': 'e73d2d586f4e',
+  'kiko/dm': 'b3e39946ab70',
+  'kiko/message': '6730b9df5bfa',
+  'kiko/invite': '1a3c1d118b9e',
+  'libby/mention': 'eb9f3ac60b02',
+  'libby/dm': '77dfd01cc3ca',
+  'libby/message': '257b84a114a2',
+  'libby/invite': '8ef7e91100b8',
+  'nibu/mention': '56484d731df3',
+  'nibu/dm': '573f5db4de4b',
+  'nibu/message': '30f6a5c9ce54',
+  'nibu/invite': 'bb36c0975f35',
+  'void/mention': 'dee69f4af562',
+  'void/dm': '92e3ebbc0b29',
+  'void/message': 'fadc5556b681',
+  'void/invite': 'd602121389d8',
+  'weksa/mention': 'db46a36ab3c5',
+  'weksa/dm': 'efe993382a46',
+  'weksa/message': '00e323635949',
+  'weksa/invite': '9bf03a36758b',
+};
 const MOTIFS: Motif[] = ['mention', 'dm', 'message', 'invite'];
 const VOICES = ['aqua', 'eureka', 'heimdall', 'kiko', 'libby', 'nibu', 'void', 'weksa'];
 
@@ -37,7 +72,7 @@ describe('dings switch', () => {
   });
 });
 
-describe('v3 manifest against the parser', () => {
+describe('v4 manifest against the parser', () => {
   it('survives parseManifest whole: no path or motif is dropped', () => {
     expect(manifest.neutral).toEqual(raw.neutral);
     expect(Object.keys(manifest.senders).sort()).toEqual(VOICES);
@@ -72,17 +107,11 @@ describe('v3 manifest against the parser', () => {
     });
   });
 
-  it("Nibu's four files are AquaSynth's proposals/nibu3 (sha256 prefix)", () => {
-    const want: Record<Motif, string> = {
-      mention: '3833f504903f',
-      dm: 'ad4839400f2c',
-      message: '6ec6fc893b94',
-      invite: 'aefb6ff79c42',
-    };
-    MOTIFS.forEach((m) => {
-      const hash = createHash('sha256').update(readFileSync(join(DINGS, `senders/nibu/${m}.ogg`)));
-      expect(hash.digest('hex').slice(0, 12)).toBe(want[m]);
-    });
+  it("every voice file is Aqua's v4 render (sha256 prefix)", () => {
+    const hash = (file: string) =>
+      createHash('sha256').update(readFileSync(join(DINGS, file))).digest('hex').slice(0, 12);
+    expect(Object.keys(V4_SHA).length).toBe(VOICES.length * MOTIFS.length);
+    Object.entries(V4_SHA).forEach(([k, want]) => expect(hash(`senders/${k}.ogg`)).toBe(want));
   });
 
   it('keeps the clip lengths the design assumes: message under 400 ms, nothing over 600 ms', () => {