diff --git a/docs/primitiver/traits.md b/docs/primitiver/traits.md
index b3f772c..18c4133 100644
--- a/docs/primitiver/traits.md
+++ b/docs/primitiver/traits.md
@@ -104,6 +104,8 @@ Fravær av en trait betyr at funksjonaliteten er deaktivert. Ingen boolean
 | `tts` | "Les opp"-knapp, lydversjon av artikler | Tekst-til-tale via jobbkø |
 | `clips` | Klipp-editor, segment-markering | Segmentering, CAS-lagring av klipp |
 | `playlist` | Ordnet avspillingsliste, drag-and-drop rekkefølge | Sekvensiell avspilling |
+| `mixer` | Lydmixer: volumslidere, mute, VU-meter, sound pads, stemme-/EQ-effekter | Pad-konfig i metadata (se `docs/features/lydmixer.md`) |
+| `studio` | Lydstudio-panel: lydfilliste med metadata, drag-ut, drop-aksept for lyd, lenke til fullverdig editor | Validering av lydformat, FFmpeg-pipeline via jobbkø (se `docs/features/lydstudio.md`) |
 
 ### Kommunikasjon
 
@@ -148,6 +150,7 @@ Fravær av en trait betyr at funksjonaliteten er deaktivert. Ingen boolean
 | `digest` | Periodisk oppsummering i UI | AI-sammendrag av aktivitet på intervall |
 | `bridge` | "Også funnet i..."-forslag | pgvector-embedding, krysskontekst-søk |
 | `moderation` | Moderasjonskø, flagging | AI-assistert innholdsvurdering |
+| `ai_tool` | AI-verktøy-panel med prompt-velger, drag-and-drop tekstbehandling | Modellprofil-mapping, AI Gateway, ai_usage_log (se `docs/features/ai_verktoy.md`) |
 
 ### Tilgang & fellesskap
 
@@ -177,16 +180,16 @@ Brukeren kan legge til eller fjerne traits etterpå.
 | Pakke | Traits |
 |---|---|
 | **Nettmagasin** | editor(longform), publishing, rss, comments, analytics, custom_domain, newsletter |
-| **Podcaststudio** | podcast, recording, transcription, editor(shownotes), rss, analytics, clips, knowledge_graph |
+| **Podcaststudio** | podcast, recording, transcription, mixer, editor(shownotes), rss, analytics, clips, knowledge_graph |
 | **Nyhetsbrev** | editor(longform), newsletter, analytics, versioning |
 | **Wiki** | wiki, editor(longform), collaboration, versioning, knowledge_graph, glossary |
 | **Diskusjonsklubb** | forum, chat, polls, membership, roles, directory |
 | **Kursplattform** | editor(longform), playlist, qa, membership, paywall, templates |
-| **Møteplass** | recording, chat, kanban, calendar, auto_summarize, guest_input |
+| **Møteplass** | recording, mixer, chat, kanban, calendar, auto_summarize, guest_input |
 | **Fotoblogg** | gallery, publishing, comments, custom_domain, rss |
 | **Prosjektstyring** | kanban, calendar, chat, table, tags, roles |
 | **Åpen forskning** | editor(longform), versioning, bibliography, publishing, comments, collaboration, api |
-| **Community radio** | recording, podcast, chat, polls, membership, clips, playlist |
+| **Community radio** | recording, mixer, podcast, chat, polls, membership, clips, playlist |
 | **Bokmerke-vegg** | bookmarks, tags, publishing, rss, comments |
 | **Redaksjon** | chat, kanban, calendar, editor(longform), knowledge_graph, guest_input |
 
diff --git a/frontend/src/lib/components/traits/StudioTrait.svelte b/frontend/src/lib/components/traits/StudioTrait.svelte
index 229e779..5eebf73 100644
--- a/frontend/src/lib/components/traits/StudioTrait.svelte
+++ b/frontend/src/lib/components/traits/StudioTrait.svelte
@@ -1,19 +1,19 @@
 <script lang="ts">
 	import type { Node } from '$lib/spacetime';
 	import { edgeStore, nodeStore, nodeVisibility } from '$lib/spacetime';
-	import { checkStudioCompat, type DragPayload } from '$lib/transfer';
+	import { setDragPayload, checkStudioCompat, type DragPayload } from '$lib/transfer';
 	import type { BlockReceiver, PlacementIntent } from '$lib/components/blockshell/types';
-	import TraitPanel from './TraitPanel.svelte';
 
 	interface Props {
 		collection: Node;
 		config: Record<string, unknown>;
 		userId?: string;
+		accessToken?: string;
 		/** Called when a drop is received on this panel */
 		onReceiveDrop?: (payload: DragPayload, intent: PlacementIntent) => void;
 	}
 
-	let { collection, config, userId, onReceiveDrop }: Props = $props();
+	let { collection, config, userId, accessToken, onReceiveDrop }: Props = $props();
 
 	/**
 	 * BlockReceiver implementation for Studio (Lydstudio).
@@ -35,7 +35,10 @@
 		}
 	};
 
-	/** Media nodes (audio files) belonging to this collection */
+	// =========================================================================
+	// Audio nodes belonging to this collection
+	// =========================================================================
+
 	const audioNodes = $derived.by(() => {
 		const nodes: Node[] = [];
 		for (const edge of edgeStore.byTarget(collection.id)) {
@@ -59,6 +62,10 @@
 		return nodes;
 	});
 
+	// =========================================================================
+	// Helpers
+	// =========================================================================
+
 	/** Check if a node has processed versions (derived_from edges) */
 	function hasVersions(nodeId: string): boolean {
 		for (const edge of edgeStore.byTarget(nodeId)) {
@@ -66,29 +73,425 @@
 		}
 		return false;
 	}
+
+	/** Get version count for a node */
+	function versionCount(nodeId: string): number {
+		let count = 0;
+		for (const edge of edgeStore.byTarget(nodeId)) {
+			if (edge.edgeType === 'derived_from') count++;
+		}
+		return count;
+	}
+
+	/** Format duration from metadata (seconds → mm:ss) */
+	function formatDuration(node: Node): string {
+		try {
+			const meta = JSON.parse(node.metadata ?? '{}');
+			if (typeof meta.duration === 'number') {
+				const m = Math.floor(meta.duration / 60);
+				const s = Math.floor(meta.duration % 60);
+				return `${m}:${String(s).padStart(2, '0')}`;
+			}
+		} catch { /* skip */ }
+		return '';
+	}
+
+	/** Format file size from metadata */
+	function formatSize(node: Node): string {
+		try {
+			const meta = JSON.parse(node.metadata ?? '{}');
+			if (typeof meta.size === 'number') {
+				const kb = meta.size / 1024;
+				if (kb < 1024) return `${Math.round(kb)} KB`;
+				return `${(kb / 1024).toFixed(1)} MB`;
+			}
+		} catch { /* skip */ }
+		return '';
+	}
+
+	/** Get MIME subtype (e.g. 'wav' from 'audio/wav') */
+	function formatType(node: Node): string {
+		try {
+			const meta = JSON.parse(node.metadata ?? '{}');
+			if (typeof meta.mime === 'string') {
+				return meta.mime.replace('audio/', '').toUpperCase();
+			}
+		} catch { /* skip */ }
+		return '';
+	}
+
+	function formatTime(node: Node): string {
+		if (!node.createdAt?.microsSinceUnixEpoch) return '';
+		const ms = Number(node.createdAt.microsSinceUnixEpoch / 1000n);
+		const date = new Date(ms);
+		return date.toLocaleDateString('nb-NO', { day: 'numeric', month: 'short' });
+	}
+
+	// =========================================================================
+	// Drag-and-drop: audio items as drag source
+	// =========================================================================
+
+	function handleDragStart(e: DragEvent, node: Node) {
+		if (!e.dataTransfer) return;
+		setDragPayload(e.dataTransfer, {
+			nodeId: node.id,
+			nodeKind: node.nodeKind,
+			sourcePanel: 'studio'
+		});
+	}
 </script>
 
-<TraitPanel title="Lydstudio" icon="studio">
+<!--
+	StudioTrait — fullverdig BlockShell-panel for lydstudio.
+	Viser lydfiler med metadata, drag-and-drop ut til andre paneler,
+	drop-aksept for lydfiler fra andre paneler, og lenke til studioet.
+	Forelder (collection page) wrapper dette i BlockShell.
+-->
+
+<div class="studio-trait">
 	{#if audioNodes.length === 0}
-		<p class="text-sm text-gray-400">Ingen lydfiler i denne samlingen enna.</p>
+		<div class="studio-empty">
+			<span class="studio-empty-icon">🎙️</span>
+			<p>Ingen lydfiler i denne samlingen.</p>
+			<p class="studio-empty-hint">Dra lydfiler hit fra andre paneler, eller last opp via studio.</p>
+		</div>
 	{:else}
-		<ul class="space-y-2">
-			{#each audioNodes as node}
-				<li class="flex items-center justify-between rounded border border-gray-100 p-2">
-					<div class="min-w-0 flex-1">
-						<p class="truncate text-sm text-gray-700">{node.title ?? 'Uten tittel'}</p>
-						{#if hasVersions(node.id)}
-							<span class="text-[10px] text-green-600">Har prosesserte versjoner</span>
-						{/if}
+		<div class="studio-header">
+			<span class="studio-header-label">Lydfiler</span>
+			<span class="studio-header-count">{audioNodes.length}</span>
+		</div>
+
+		<div class="studio-items">
+			{#each audioNodes as node (node.id)}
+				{@const duration = formatDuration(node)}
+				{@const size = formatSize(node)}
+				{@const type = formatType(node)}
+				{@const versions = versionCount(node.id)}
+				{@const date = formatTime(node)}
+				<!-- svelte-ignore a11y_no_static_element_interactions -->
+				<div
+					class="studio-item"
+					draggable="true"
+					ondragstart={(e) => handleDragStart(e, node)}
+				>
+					<div class="studio-item-main">
+						<div class="studio-item-icon">🎵</div>
+						<div class="studio-item-text">
+							<span class="studio-item-title">{node.title ?? 'Uten tittel'}</span>
+							<div class="studio-item-meta">
+								{#if type}
+									<span class="studio-item-tag">{type}</span>
+								{/if}
+								{#if duration}
+									<span class="studio-item-duration">{duration}</span>
+								{/if}
+								{#if size}
+									<span class="studio-item-size">{size}</span>
+								{/if}
+								{#if date}
+									<span class="studio-item-date">{date}</span>
+								{/if}
+							</div>
+						</div>
+						<div class="studio-item-actions">
+							{#if versions > 0}
+								<span class="studio-item-versions" title="{versions} prosesserte versjon(er)">
+									{versions} ver.
+								</span>
+							{/if}
+							<a
+								href="/studio/{node.id}"
+								class="studio-edit-btn"
+								title="Åpne i lydstudio"
+								onclick={(e) => e.stopPropagation()}
+							>
+								Rediger
+							</a>
+						</div>
 					</div>
-					<a
-						href="/studio/{node.id}"
-						class="ml-2 shrink-0 rounded bg-blue-50 px-3 py-1 text-xs text-blue-600 transition-colors hover:bg-blue-100"
-					>
-						Rediger
-					</a>
-				</li>
+				</div>
 			{/each}
-		</ul>
+		</div>
 	{/if}
-</TraitPanel>
+</div>
+
+<style>
+	/* ================================================================= */
+	/* Root — fills BlockShell content area                               */
+	/* ================================================================= */
+	.studio-trait {
+		display: flex;
+		flex-direction: column;
+		height: 100%;
+		min-height: 0;
+		overflow: hidden;
+	}
+
+	/* ================================================================= */
+	/* Empty state                                                        */
+	/* ================================================================= */
+	.studio-empty {
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		justify-content: center;
+		flex: 1;
+		padding: 24px;
+		color: #9ca3af;
+		font-size: 13px;
+		text-align: center;
+		gap: 4px;
+	}
+
+	.studio-empty-icon {
+		font-size: 28px;
+	}
+
+	.studio-empty-hint {
+		font-size: 11px;
+		color: #d1d5db;
+		margin-top: 4px;
+	}
+
+	/* ================================================================= */
+	/* Header                                                             */
+	/* ================================================================= */
+	.studio-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		padding: 8px 12px;
+		flex-shrink: 0;
+		border-bottom: 1px solid #f3f4f6;
+	}
+
+	.studio-header-label {
+		font-size: 11px;
+		color: #9ca3af;
+		text-transform: uppercase;
+		letter-spacing: 0.03em;
+	}
+
+	.studio-header-count {
+		font-size: 11px;
+		color: #9ca3af;
+		background: #f3f4f6;
+		border-radius: 9999px;
+		padding: 0 6px;
+		line-height: 18px;
+	}
+
+	/* ================================================================= */
+	/* Items list                                                         */
+	/* ================================================================= */
+	.studio-items {
+		flex: 1;
+		overflow-y: auto;
+		padding: 6px;
+		display: flex;
+		flex-direction: column;
+		gap: 4px;
+		min-height: 0;
+	}
+
+	.studio-item {
+		background: white;
+		border: 1px solid #e5e7eb;
+		border-radius: 6px;
+		padding: 8px 10px;
+		cursor: grab;
+		transition: box-shadow 0.1s, border-color 0.15s;
+	}
+
+	.studio-item:hover {
+		box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
+		border-color: #d1d5db;
+	}
+
+	.studio-item:active {
+		cursor: grabbing;
+	}
+
+	.studio-item-main {
+		display: flex;
+		align-items: center;
+		gap: 8px;
+	}
+
+	.studio-item-icon {
+		font-size: 16px;
+		flex-shrink: 0;
+		line-height: 1;
+	}
+
+	.studio-item-text {
+		flex: 1;
+		min-width: 0;
+		display: flex;
+		flex-direction: column;
+		gap: 2px;
+	}
+
+	.studio-item-title {
+		font-size: 13px;
+		font-weight: 500;
+		color: #1f2937;
+		line-height: 1.3;
+		overflow: hidden;
+		text-overflow: ellipsis;
+		white-space: nowrap;
+	}
+
+	.studio-item-meta {
+		display: flex;
+		align-items: center;
+		gap: 6px;
+		flex-wrap: wrap;
+	}
+
+	.studio-item-tag {
+		font-size: 9px;
+		font-weight: 600;
+		color: #7c3aed;
+		background: #ede9fe;
+		border-radius: 3px;
+		padding: 0 4px;
+		line-height: 16px;
+	}
+
+	.studio-item-duration {
+		font-size: 11px;
+		color: #6b7280;
+		font-variant-numeric: tabular-nums;
+	}
+
+	.studio-item-size {
+		font-size: 10px;
+		color: #9ca3af;
+	}
+
+	.studio-item-date {
+		font-size: 10px;
+		color: #9ca3af;
+	}
+
+	.studio-item-actions {
+		display: flex;
+		align-items: center;
+		gap: 6px;
+		flex-shrink: 0;
+	}
+
+	.studio-item-versions {
+		font-size: 10px;
+		color: #059669;
+		white-space: nowrap;
+	}
+
+	.studio-edit-btn {
+		padding: 4px 10px;
+		border-radius: 4px;
+		font-size: 11px;
+		font-weight: 500;
+		background: #ede9fe;
+		color: #7c3aed;
+		text-decoration: none;
+		transition: background 0.1s;
+		white-space: nowrap;
+	}
+
+	.studio-edit-btn:hover {
+		background: #ddd6fe;
+	}
+
+	/* ================================================================= */
+	/* Responsive within bounded container                                */
+	/* ================================================================= */
+
+	/* Small panels: compact layout */
+	@container (max-width: 360px) {
+		.studio-header {
+			padding: 6px 8px;
+		}
+
+		.studio-items {
+			padding: 4px;
+		}
+
+		.studio-item {
+			padding: 6px 8px;
+		}
+
+		.studio-item-icon {
+			display: none;
+		}
+
+		.studio-item-title {
+			font-size: 12px;
+		}
+
+		.studio-item-meta {
+			gap: 4px;
+		}
+
+		.studio-item-versions {
+			display: none;
+		}
+
+		.studio-edit-btn {
+			padding: 3px 8px;
+			font-size: 10px;
+		}
+
+		.studio-empty {
+			padding: 16px;
+			font-size: 12px;
+		}
+
+		.studio-empty-icon {
+			font-size: 22px;
+		}
+	}
+
+	/* Medium panels: slightly tighter */
+	@container (max-width: 500px) {
+		.studio-item-size {
+			display: none;
+		}
+
+		.studio-item-date {
+			display: none;
+		}
+	}
+
+	/* Mobile viewport fallback */
+	@media (max-width: 480px) {
+		.studio-header {
+			padding: 6px 8px;
+		}
+
+		.studio-items {
+			padding: 4px;
+		}
+
+		.studio-item {
+			padding: 6px 8px;
+		}
+
+		.studio-item-icon {
+			display: none;
+		}
+
+		.studio-item-title {
+			font-size: 12px;
+		}
+
+		.studio-item-size {
+			display: none;
+		}
+
+		.studio-empty {
+			padding: 16px;
+		}
+	}
+</style>
diff --git a/frontend/src/routes/collection/[id]/+page.svelte b/frontend/src/routes/collection/[id]/+page.svelte
index df97fe7..587b9e3 100644
--- a/frontend/src/routes/collection/[id]/+page.svelte
+++ b/frontend/src/routes/collection/[id]/+page.svelte
@@ -350,7 +350,7 @@
 							{:else if trait === 'transcription'}
 								<TranscriptionTrait collection={collectionNode} config={traits[trait]} />
 							{:else if trait === 'studio'}
-								<StudioTrait collection={collectionNode} config={traits[trait]} userId={nodeId} />
+								<StudioTrait collection={collectionNode} config={traits[trait]} userId={nodeId} {accessToken} />
 							{:else if trait === 'mixer'}
 								<MixerTrait collection={collectionNode} config={traits[trait]} {accessToken} />
 							{/if}
@@ -405,7 +405,7 @@
 							{:else if trait === 'transcription'}
 								<TranscriptionTrait collection={collectionNode} config={traits[trait]} />
 							{:else if trait === 'studio'}
-								<StudioTrait collection={collectionNode} config={traits[trait]} userId={nodeId} />
+								<StudioTrait collection={collectionNode} config={traits[trait]} userId={nodeId} {accessToken} />
 							{:else if trait === 'mixer'}
 								<MixerTrait collection={collectionNode} config={traits[trait]} {accessToken} />
 							{/if}
diff --git a/tasks.md b/tasks.md
index 643cc07..3648623 100644
--- a/tasks.md
+++ b/tasks.md
@@ -231,8 +231,7 @@ Ref: `docs/features/universell_overfoering.md`, `docs/retninger/arbeidsflaten.md
 - [x] 20.6 Panelrework — Kanban: gjør KanbanTrait til BlockShell-panel med drag-and-drop aksept fra andre paneler, fullskjerm, responsivt.
 - [x] 20.7 Panelrework — Kalender: gjør CalendarTrait til BlockShell-panel med drop-aksept for scheduling, fullskjerm, responsivt.
 - [x] 20.8 Panelrework — Editor/Artikkelverktøy: gjør artikkelverktøy til BlockShell-panel med source_material mottak fra andre paneler. Ref: `docs/features/artikkelverktoy.md`.
-- [~] 20.9 Panelrework — Studio: gjør StudioTrait til BlockShell-panel med drop-aksept for lydfiler, fullskjerm, responsivt.
-  > Påbegynt: 2026-03-18T08:48
+- [x] 20.9 Panelrework — Studio: gjør StudioTrait til BlockShell-panel med drop-aksept for lydfiler, fullskjerm, responsivt.
 
 ## Fase 21: CLI-verktøy — Unix-filosofi