diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70462d6..bfc56ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -84,6 +84,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   against — charrette D5), and mute still always wins. "Solo my source track"
   now truly isolates the paired stem; solo the master strip alongside it to
   compare the two.
+- **Soloing a transcription track now isolates it too — solo is one rule
+  across both bands.** The audio-band scoping above kept the Master Mix immune
+  to transcription-part solos, so soloing a part left the full-mix recording
+  (and with it, the song) playing over the isolated part. Solo now means
+  *isolate* everywhere: any solo silences every unsoloed strip, the master
+  included — matching what the stems already did. To keep the recording as a
+  reference while soloing a part, solo the Master Mix alongside it; mute still
+  always wins.
 - **Replace Audio no longer crosses song boundaries.** If an upload or download
   finishes after you switch songs, close the dialog, or start another Replace
   Audio request, the stale result is discarded instead of being applied to the
diff --git a/docs/USER-GUIDE.md b/docs/USER-GUIDE.md
index 6234730..2429a6c 100644
--- a/docs/USER-GUIDE.md
+++ b/docs/USER-GUIDE.md
@@ -104,9 +104,10 @@ A few sources arrive through their own doors, any time after creation:
   **drum pad strip** for drum tracks.
 - **Mixer** (`Shift+C`) — per-track volume / mute / solo. Audio and transcription
   tracks are live together by default; mute or solo the channels you want to hear.
-  Soloing an **audio** track isolates it — the Master Mix mutes with the rest of
-  the audio band (solo the master too to hear both). Soloing a **transcription**
-  track keeps the recording audible as your reference.
+  Solo means *isolate*: soloing any track — audio or transcription — silences
+  everything unsoloed, the Master Mix included. Solo several tracks to hear them
+  together (for example a transcription track plus the Master Mix to keep the
+  recording as your reference). Mute always wins over solo.
 
 Press **`?`** at any time for the searchable shortcut panel, or **`Ctrl+K`** for
 the command palette.
diff --git a/src/audio.js b/src/audio.js
index 57c2520..28963b0 100644
--- a/src/audio.js
+++ b/src/audio.js
@@ -2330,8 +2330,8 @@ function _guideTick() {
     if (to <= from) return;
     // Per-part mute/solo (mixer panel, B6): the active surface's part gates
     // its own guide here (only the guide — the reference audio rides its own
-    // per-source strips: part solos never gate it (D5), and audio-band solos
-    // reach it through applyStemMix, never this path). Gated at the
+    // per-source strips: any solo reaches it through applyStemMix and the
+    // whole-map strip rule, never this path). Gated at the
     // scheduler, not in _guideSourceTimes, so it never touches song duration.
     // The pitched GM voice IS this part's guide voice, so it sits inside the
     // same gate as the clap fallback.
diff --git a/src/host.js b/src/host.js
index 4c44d7a..d3297f0 100644
--- a/src/host.js
+++ b/src/host.js
@@ -203,8 +203,8 @@ export const host = {
      * schedules voices. Lives in src/mixer-panel.js (the canonical
      * `S.partMix` owner); audio.js must not import that module, so it
      * crosses here. Inert default: audible at unity — exactly the
-     * pre-panel behavior. Part solo NEVER gates the reference recording
-     * (D5), which rides its own transparent gain path.
+     * pre-panel behavior. The reference recording never passes through this
+     * hook — its gate is its own 'audio:master' strip (partStripState).
      */
     partClapState: () => ({ audible: true, vol: 1 }),
     /**
diff --git a/src/mixer-panel.js b/src/mixer-panel.js
index 9c0cb0e..f55d752 100644
--- a/src/mixer-panel.js
+++ b/src/mixer-panel.js
@@ -14,9 +14,11 @@
 // per-part instrument voices (GM slice) read the SAME state when they arrive —
 // this panel is the source of truth, not a mirror.
 //
-// The solo rule is the DAW one: any solo anywhere → only soloed parts sound;
-// mute always wins. The recording / guide / click BUSES are not parts and are
-// never gated by part solo — solo keeps the reference audible (charrette D5).
+// The solo rule is the DAW one: any solo anywhere → only soloed strips sound;
+// mute always wins. It spans BOTH bands — the master-mix strip is a peer audio
+// track, so a transcription-part solo silences it like anything else (solo the
+// master too to hear both). Only the recording / guide / click BUSES sit
+// outside the rule: buses are not parts and are never gated by solo.
 // Audio consumes the state through `host.partClapState` (inert default:
 // audible at unity), so src/audio.js never imports this module.
 //
@@ -122,27 +124,17 @@ export function _mixerAnySoloPure(partMix) {
     if (!partMix || typeof partMix !== 'object') return false;
     return Object.keys(partMix).some(k => partMix[k] && partMix[k].solo);
 }
-// Any solo within the AUDIO band ('audio:<id>' strips, the master included)?
-// The master's solo immunity is scoped to this: it ignores transcription-part
-// solos (D5 — the reference stays audible while charting) but joins the rule
-// when the solo lives in its own band, so soloing a stem actually isolates it.
-export function _mixerAnyAudioSoloPure(partMix) {
-    if (!partMix || typeof partMix !== 'object') return false;
-    return Object.keys(partMix).some(k => k.startsWith('audio:') && partMix[k] && partMix[k].solo);
-}
 // The DAW audibility rule over PART keys only: mute always wins; any solo
-// anywhere means only soloed parts sound. Buses (recording/guide/click) are
-// not parts and never pass through here — solo keeps the reference audible.
+// anywhere means only soloed strips sound. One rule for BOTH bands — the
+// master mix strip is a peer AUDIO TRACK (the full-mix recording; the actual
+// output fader is the mixer's master BUS, not this strip), so a transcription-
+// part solo silences it exactly like a stem solo does. Soloing a track means
+// "isolate this" — hear the reference alongside a soloed part by soloing the
+// master too. Buses (recording/guide/click) are not parts and never pass
+// through here.
 export function _mixerPartAudiblePure(partMix, key) {
     const st = _mixerPartStatePure(partMix, key);
     if (st.mute) return false;
-    // The master mix strip is a peer AUDIO TRACK (the full-mix recording) —
-    // the actual output fader is the mixer's master BUS, not this strip. But
-    // it is also the default reference every part is charted against, so a
-    // TRANSCRIPTION part's solo never silences it (D5); only a solo within
-    // the audio band does — soloing a stem mutes the full mix like any DAW
-    // console, and the master's own solo isolates the recording.
-    if (key === 'audio:master') return _mixerAnyAudioSoloPure(partMix) ? st.solo : true;
     return _mixerAnySoloPure(partMix) ? st.solo : true;
 }
 // The mix key of the ACTIVE editing surface: the drums arrangement's channel
diff --git a/src/track-session.js b/src/track-session.js
index 0d61c9e..d26e961 100644
--- a/src/track-session.js
+++ b/src/track-session.js
@@ -724,9 +724,9 @@ function render() {
     // master from the pane is a real workflow — dogfooding sessions kept
     // reaching for it — so the pane now mirrors the drawer. Same keys, same
     // handlers (mix-mute/mix-solo/mix-vol are key-generic), and the master
-    // keeps its reference semantics: a transcription part's solo never
-    // silences it (D5), while a solo within the audio band — a stem's or its
-    // own — gates it like any peer track (_mixerPartAudiblePure).
+    // follows the one whole-map solo rule like any peer track: any solo —
+    // a transcription part's, a stem's, or its own — gates it
+    // (_mixerPartAudiblePure).
     const mixControls = row => {
         if (!_trackRowShowsStripPure(row)) return '';
         const key = _editorEscHtml(row.mixKey);
diff --git a/tests/mixer_panel.test.mjs b/tests/mixer_panel.test.mjs
index 7b5785a..f31f261 100644
--- a/tests/mixer_panel.test.mjs
+++ b/tests/mixer_panel.test.mjs
@@ -4,9 +4,10 @@
  * canonical per-part mix state `S.partMix`.
  *
  * Pinned here: the pure strip-state model (defaults, clamps, the DAW
- * mute-wins/solo-isolates audibility rule), the clap-state the guide
- * scheduler consumes (drums vs current-arrangement key, volume scaling,
- * and — D5 — that it is a PART gate: the host-hook default leaves audio
+ * mute-wins/solo-isolates audibility rule — ONE rule across both bands,
+ * the master strip included), the clap-state the guide scheduler consumes
+ * (drums vs current-arrangement key, volume scaling, and that it is a
+ * PART gate: the host-hook default leaves audio
  * untouched and no bus is ever a part), the panel open-state pref
  * round-trip, the memoized render, and that a double init can never stack
  * delegated listeners (re-inject safety).
@@ -65,7 +66,7 @@ globalThis.localStorage = globalThis.localStorage || {
 globalThis.window = globalThis.window || globalThis;
 
 const {
-    _mixerPartsPure, _mixerPartStatePure, _mixerAnySoloPure, _mixerAnyAudioSoloPure,
+    _mixerPartsPure, _mixerPartStatePure, _mixerAnySoloPure,
     _mixerPartAudiblePure,
     _mixerClapStatePure, _mixerActivePartKeyPure, _mixerOpenFromStoredPure, _mixerClapState,
     _mixerGainForFaderPure, _mixerFaderLabelPure, _mixerOrderedPartsPure,
@@ -154,17 +155,23 @@ t('audibility: any solo isolates the soloed strips', () => {
     assert.strictEqual(_mixerPartAudiblePure(mix, 'drums'), false);
 });
 
-t('master honors D5 for part solos but joins the solo rule inside the audio band', () => {
-    // A transcription-part solo (plus an unrelated mute) — the master stays
-    // audible: it is the reference the parts are charted against (D5).
+t('one solo rule spans both bands: the master is a peer strip, never immune', () => {
+    // A TRANSCRIPTION-part solo silences the master like anything else —
+    // pre-fix the 'audio:master' carve-out kept the full mix playing over a
+    // soloed part, so soloing a transcription track never isolated it.
     const partSolo = { 'arr:0': { solo: true }, 'arr:1': { mute: true } };
-    assert.strictEqual(_mixerAnyAudioSoloPure(partSolo), false, 'part solos are not audio-band solos');
-    assert.strictEqual(_mixerPartAudiblePure(partSolo, 'audio:master'), true);
-    // A soloed STEM must actually isolate: the master (the full-mix recording,
-    // a peer audio track) mutes with the rest — pre-fix it kept playing over
-    // every solo, so soloing an audio track never isolated it.
+    assert.strictEqual(_mixerPartAudiblePure(partSolo, 'audio:master'), false,
+        'a transcription-part solo silences the master');
+    assert.strictEqual(_mixerPartAudiblePure(partSolo, 'audio:gtr'), false,
+        'and the stems');
+    assert.strictEqual(_mixerPartAudiblePure(partSolo, 'arr:0'), true, 'the soloed part sounds');
+    // Hear the reference alongside a soloed part: solo the master too.
+    const partPlusMaster = { 'arr:0': { solo: true }, 'audio:master': { solo: true } };
+    assert.strictEqual(_mixerPartAudiblePure(partPlusMaster, 'audio:master'), true);
+    assert.strictEqual(_mixerPartAudiblePure(partPlusMaster, 'arr:0'), true);
+    assert.strictEqual(_mixerPartAudiblePure(partPlusMaster, 'arr:1'), false);
+    // A soloed STEM isolates the same way (the #348 behavior, kept).
     const stemSolo = { 'audio:gtr': { solo: true }, 'arr:0': { mute: true } };
-    assert.strictEqual(_mixerAnyAudioSoloPure(stemSolo), true);
     assert.strictEqual(_mixerPartAudiblePure(stemSolo, 'audio:master'), false, 'a stem solo silences the master');
     assert.strictEqual(_mixerPartAudiblePure(stemSolo, 'audio:gtr'), true, 'the soloed stem sounds');
     assert.strictEqual(_mixerPartAudiblePure(stemSolo, 'audio:bass'), false, 'an unsoloed stem is still isolated out');
@@ -173,7 +180,9 @@ t('master honors D5 for part solos but joins the solo rule inside the audio band
     const masterSolo = { 'audio:master': { solo: true } };
     assert.strictEqual(_mixerPartAudiblePure(masterSolo, 'audio:master'), true);
     assert.strictEqual(_mixerPartAudiblePure(masterSolo, 'audio:gtr'), false);
-    // Master + stem both soloed → both sound (peers in one band).
+    assert.strictEqual(_mixerPartAudiblePure(masterSolo, 'arr:0'), false,
+        'the master\'s solo silences unsoloed parts too — one rule, both directions');
+    // Master + stem both soloed → both sound.
     const both = { 'audio:master': { solo: true }, 'audio:gtr': { solo: true } };
     assert.strictEqual(_mixerPartAudiblePure(both, 'audio:master'), true);
     assert.strictEqual(_mixerPartAudiblePure(both, 'audio:gtr'), true);
@@ -181,8 +190,8 @@ t('master honors D5 for part solos but joins the solo rule inside the audio band
     assert.strictEqual(_mixerPartAudiblePure({ 'audio:master': { mute: true, solo: true } }, 'audio:master'), false);
     assert.strictEqual(_mixerPartAudiblePure({ 'audio:master': { mute: true } }, 'audio:master'), false);
     // Malformed maps never throw and never phantom-solo.
-    assert.strictEqual(_mixerAnyAudioSoloPure(null), false);
-    assert.strictEqual(_mixerAnyAudioSoloPure({ 'audio:gtr': null }), false);
+    assert.strictEqual(_mixerAnySoloPure(null), false);
+    assert.strictEqual(_mixerPartAudiblePure({ 'audio:gtr': null }, 'audio:master'), true);
 });
 
 // ── The clap state the guide scheduler consumes ──────────────────────
@@ -202,14 +211,14 @@ t('clap state follows the active surface: the drums arrangement in drum mode, el
         'drum mode with no drums arrangement → currentArr');
 });
 
-t('solo keeps the reference audible (D5): the gate is per-PART, and the host default leaves audio untouched', () => {
+t('the clap gate is per-PART, and the host default leaves audio untouched', () => {
     // Soloing a part silences other PARTS' claps…
     const mix = { 'arr:0': { solo: true } };
     assert.strictEqual(_mixerClapStatePure(mix, false, 1).audible, false);
     // …but the hook audio.js consults defaults to audible-at-unity, so with
     // no panel wired (or nothing muted/soloed) nothing is gated — and the
-    // reference bus never passes through this gate at all: buses are not
-    // part keys, and audio.js only consults the hook on the CLAP path.
+    // recording/guide/click BUSES never pass through this gate at all: buses
+    // are not part keys, and audio.js only consults the hook on the CLAP path.
     assert.deepStrictEqual(host.partClapState(), { audible: true, vol: 1 });
     assert.strictEqual(_mixerClapStatePure(mix, false, 0).audible, true);
 });
diff --git a/tests/stem_engine.test.mjs b/tests/stem_engine.test.mjs
index ac6657d..af8aa39 100644
--- a/tests/stem_engine.test.mjs
+++ b/tests/stem_engine.test.mjs
@@ -81,8 +81,8 @@ t('a stem solo gates the master through the LIVE strip hook the engine ramps fro
             'while a stem is soloed the master gain ramps to 0 (pre-fix: stayed at unity)');
         assert.deepStrictEqual(_mixerPartStripState('audio:Guitar_L'), { audible: true, vol: 1 });
         S.partMix = { 'arr:0': { solo: true } };
-        assert.deepStrictEqual(_mixerPartStripState('audio:master'), { audible: true, vol: 1 },
-            'a transcription-part solo leaves the master reference audible (D5)');
+        assert.deepStrictEqual(_mixerPartStripState('audio:master'), { audible: false, vol: 1 },
+            'a transcription-part solo gates the master too — one solo rule across bands');
         S.partMix = { 'audio:master': { solo: true }, 'audio:Guitar_L': {} };
         assert.deepStrictEqual(_mixerPartStripState('audio:master'), { audible: true, vol: 1 },
             'the master\'s own solo keeps it audible');