diff --git a/csound-live-code b/csound-live-code
new file mode 160000
index 0000000..71b9973
--- /dev/null
+++ b/csound-live-code
@@ -0,0 +1 @@
+Subproject commit 71b9973520f6491bc8773418360e1e3b479f7cff
diff --git a/src/App.svelte b/src/App.svelte
index 17acd60..3ea49b8 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -31,6 +31,7 @@
     FileStack,
     PanelLeftOpen,
     PanelRightOpen,
+    CircleStop,
   } from "lucide-svelte";
 
   const appContext = createAppContext();
@@ -44,7 +45,7 @@
     uiState,
     executionContext,
   } = appContext;
-  const csoundDerived = createCsoundDerivedStores(csound);
+  const { logs: csoundLogs, initialized, compiled, running } = createCsoundDerivedStores(csound);
 
   let analyserNode = $state<AnalyserNode | null>(null);
   let interpreterLogs = $state<LogEntry[]>([]);
@@ -91,9 +92,27 @@
       projectEditor.loadProject(projectToLoad);
     }
 
-    logsUnsubscribe = csoundDerived.logs.subscribe((logs) => {
+    logsUnsubscribe = csoundLogs.subscribe((logs) => {
       interpreterLogs = logs;
     });
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if ((e.ctrlKey || e.metaKey) && e.key === '.') {
+        e.preventDefault();
+        handleStop();
+      }
+
+      if ((e.ctrlKey || e.metaKey) && e.key === 's') {
+        e.preventDefault();
+        handleSave();
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+
+    return () => {
+      window.removeEventListener('keydown', handleKeyDown);
+    };
   });
 
   onDestroy(async () => {
@@ -220,6 +239,14 @@
     }
   }
 
+  async function handleStop() {
+    try {
+      await csound.stop();
+    } catch (error) {
+      console.error("Failed to stop:", error);
+    }
+  }
+
   $effect(() => {
     if (uiState.scopePopupVisible || uiState.spectrogramPopupVisible) {
       analyserNode = csound.getAnalyserNode();
@@ -281,6 +308,14 @@
 <div class="app-container">
   <TopBar title="OldBoy">
     {#snippet leftActions()}
+      <button
+        onclick={handleStop}
+        class="icon-button stop-button"
+        disabled={!$running}
+        title="Stop audio (Ctrl+.)"
+      >
+        <CircleStop size={18} />
+      </button>
       <button
         class="icon-button"
         onclick={handleNewFromTemplate}
@@ -292,8 +327,8 @@
         class="icon-button"
         onclick={handleSave}
         disabled={!projectEditor.hasUnsavedChanges}
-        title="Save {projectEditor.hasUnsavedChanges
-          ? '(unsaved changes)'
+        title="Save (Ctrl+S){projectEditor.hasUnsavedChanges
+          ? ' - unsaved changes'
           : ''}"
         class:has-changes={projectEditor.hasUnsavedChanges}
       >
@@ -537,6 +572,15 @@
     color: #646cff;
   }
 
+  .icon-button.stop-button:not(:disabled) {
+    color: #ff6b6b;
+  }
+
+  .icon-button.stop-button:hover:not(:disabled) {
+    color: #ff5252;
+    border-color: #ff5252;
+  }
+
   h3 {
     margin-top: 0;
     color: rgba(255, 255, 255, 0.87);
diff --git a/src/lib/components/editor/Editor.svelte b/src/lib/components/editor/Editor.svelte
index 0cd1240..39dc14d 100644
--- a/src/lib/components/editor/Editor.svelte
+++ b/src/lib/components/editor/Editor.svelte
@@ -42,6 +42,7 @@
   const lineNumbersCompartment = new Compartment();
   const lineWrappingCompartment = new Compartment();
   const vimCompartment = new Compartment();
+  const languageCompartment = new Compartment();
 
   function handleExecute() {
     if (!editorView) return;
@@ -111,11 +112,13 @@
 
     const initSettings = $editorSettings;
 
+    const fileType = mode === 'livecoding' ? 'orc' : 'csd';
+
     editorView = new EditorView({
       doc: value,
       extensions: [
         ...baseExtensions,
-        csoundMode({ fileType: 'csd' }),
+        languageCompartment.of(csoundMode({ fileType })),
         oneDark,
         evaluateKeymap,
         flashField(),
@@ -154,6 +157,15 @@
     editorView.dom.style.fontFamily = settings.fontFamily;
   });
 
+  $effect(() => {
+    if (!editorView) return;
+
+    const fileType = mode === 'livecoding' ? 'orc' : 'csd';
+    editorView.dispatch({
+      effects: languageCompartment.reconfigure(csoundMode({ fileType }))
+    });
+  });
+
   onDestroy(() => {
     if (editorView) {
       editorView.destroy();
diff --git a/src/lib/csound/engine.ts b/src/lib/csound/engine.ts
index 0ff7054..4cf87b6 100644
--- a/src/lib/csound/engine.ts
+++ b/src/lib/csound/engine.ts
@@ -1,13 +1,10 @@
 import { Csound } from '@csound/browser';
 
-export type InstanceMode = 'persistent' | 'ephemeral';
-
 export interface CsoundEngineOptions {
   onMessage?: (message: string) => void;
   onError?: (error: string) => void;
   onPerformanceEnd?: () => void;
   onAnalyserNodeCreated?: (node: AnalyserNode) => void;
-  instanceMode?: InstanceMode;
 }
 
 export interface PerformanceMetrics {
@@ -30,16 +27,15 @@ export class CsoundEngine {
   private scopeNode: AnalyserNode | null = null;
   private audioNode: AudioNode | null = null;
   private audioContext: AudioContext | null = null;
-  private instanceMode: InstanceMode;
 
   constructor(options: CsoundEngineOptions = {}) {
     this.options = options;
-    this.instanceMode = options.instanceMode ?? 'ephemeral';
   }
 
   async init(): Promise<void> {
     if (this.initialized) return;
 
+    await this.ensureCsoundInstance();
     this.initialized = true;
     this.log('Csound ready');
   }
@@ -49,10 +45,51 @@ export class CsoundEngine {
       this.log('Creating Csound instance...');
       this.csound = await Csound();
       this.setupCallbacks();
-      await this.csound.setOption('-odac');
     }
   }
 
+  async restart(): Promise<void> {
+    this.log('Restarting Csound...');
+
+    if (this.running) {
+      await this.stop();
+    }
+
+    if (this.csound) {
+      try {
+        await this.csound.reset();
+      } catch (error) {
+        this.log('Reset failed, creating new instance...');
+        await this.cleanupInstance();
+        await this.ensureCsoundInstance();
+      }
+    } else {
+      await this.ensureCsoundInstance();
+    }
+
+    await this.csound!.setOption('-m0');
+    await this.csound!.setOption('-odac');
+    await this.csound!.setOption('-+msg_color=false');
+    await this.csound!.setOption('--daemon');
+
+    const ac = await this.csound!.getAudioContext();
+    const sampleRate = ac?.sampleRate || 48000;
+
+    const header = `sr = ${sampleRate}\nksmps = 32\n0dbfs = 1\nnchnls = 2\nnchnls_i = 1`;
+
+    const compileResult = await this.csound!.compileOrc(header);
+    if (compileResult !== 0) {
+      throw new Error('Failed to compile base header');
+    }
+
+    await this.csound!.start();
+
+    this.compiled = true;
+    this.running = true;
+    this.setupAnalyser();
+    this.log('Csound restarted and ready');
+  }
+
   private setupCallbacks(): void {
     if (!this.csound) return;
 
@@ -78,11 +115,13 @@ export class CsoundEngine {
       throw new Error('Csound not initialized. Call init() first.');
     }
 
-    try {
-      await this.ensureCsoundInstance();
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
 
+    try {
       this.log('Compiling orchestra...');
-      const result = await this.csound!.compileOrc(orchestra);
+      const result = await this.csound.compileOrc(orchestra);
 
       if (result !== 0) {
         const errorMsg = 'Orchestra compilation failed';
@@ -135,7 +174,7 @@ export class CsoundEngine {
     await this.csound!.readScore(event);
   }
 
-  async evaluateCode(code: string, forceNewInstance = false): Promise<void> {
+  async evaluateCode(code: string): Promise<void> {
     if (!this.initialized) {
       throw new Error('Csound not initialized. Call init() first.');
     }
@@ -145,22 +184,10 @@ export class CsoundEngine {
         await this.stop();
       }
 
-      const needsNewInstance = forceNewInstance ||
-                               this.instanceMode === 'ephemeral' ||
-                               !this.csound;
-
-      if (needsNewInstance && this.csound) {
-        this.log('Destroying existing instance...');
-        await this.cleanupInstance();
-      } else if (this.csound && this.compiled) {
-        this.log('Resetting Csound for new performance...');
-        await this.resetForNewPerformance();
-      }
+      await this.restart();
 
       this.scopeNode = null;
 
-      await this.ensureCsoundInstance();
-
       const orcMatch = code.match(/<CsInstruments>([\s\S]*?)<\/CsInstruments>/);
       const scoMatch = code.match(/<CsScore>([\s\S]*?)<\/CsScore>/);
 
@@ -171,13 +198,12 @@ export class CsoundEngine {
       const orc = orcMatch[1].trim();
       const sco = scoMatch[1].trim();
 
-      const compileResult = await this.compileOrchestra(orc);
-      if (!compileResult.success) {
-        throw new Error(compileResult.errorMessage || 'Compilation failed');
-      }
+      await this.csound!.compileOrc(orc);
+      this.compiled = true;
 
-      await this.readScore(sco);
-      await this.startPerformance();
+      if (sco) {
+        await this.readScore(sco);
+      }
 
     } catch (error) {
       this.running = false;
@@ -298,31 +324,6 @@ export class CsoundEngine {
     }
   }
 
-  async reset(): Promise<void> {
-    this.log('Resetting Csound...');
-    await this.stop();
-    await this.cleanupInstance();
-    this.compiled = false;
-    await this.ensureCsoundInstance();
-    this.log('Reset complete');
-  }
-
-  private async resetForNewPerformance(): Promise<void> {
-    if (!this.csound) return;
-
-    try {
-      await this.csound.reset();
-      await this.csound.setOption('-odac');
-      this.compiled = false;
-      this.running = false;
-      this.audioNode = null;
-      this.audioContext = null;
-      this.scopeNode = null;
-    } catch (error) {
-      this.log('Reset failed, creating new instance...');
-      await this.cleanupInstance();
-    }
-  }
 
   private async cleanupInstance(): Promise<void> {
     if (!this.csound) return;
diff --git a/src/lib/csound/execution-context.ts b/src/lib/csound/execution-context.ts
index ef9ed61..041b715 100644
--- a/src/lib/csound/execution-context.ts
+++ b/src/lib/csound/execution-context.ts
@@ -78,6 +78,10 @@ export class ExecutionContext {
     await this.endSession();
     this.currentMode = newMode;
     this.strategy = this.createStrategyForMode(newMode);
+
+    if (newMode === 'composition') {
+      await this.csound.stop();
+    }
   }
 
   private createStrategyForMode(mode: ProjectMode): ExecutionStrategy {
diff --git a/src/lib/csound/execution-strategies.ts b/src/lib/csound/execution-strategies.ts
index 91bf71e..c71c516 100644
--- a/src/lib/csound/execution-strategies.ts
+++ b/src/lib/csound/execution-strategies.ts
@@ -25,7 +25,6 @@ export class CompositionStrategy implements ExecutionStrategy {
 
 export class LiveCodingStrategy implements ExecutionStrategy {
   private isInitialized = false;
-  private headerCompiled = false;
 
   async execute(
     csound: CsoundStore,
@@ -34,95 +33,40 @@ export class LiveCodingStrategy implements ExecutionStrategy {
     source: EvalSource
   ): Promise<void> {
     if (!this.isInitialized) {
-      await this.initializeFromDocument(csound, fullContent);
+      await csound.restart();
       this.isInitialized = true;
-      return;
     }
 
     await this.evaluateBlock(csound, code);
   }
 
-  private async initializeFromDocument(
-    csound: CsoundStore,
-    fullContent: string
-  ): Promise<void> {
-    const { header, instruments, score } = this.parseCSD(fullContent);
-
-    const fullOrchestra = header + '\n' + instruments;
-    const compileResult = await csound.compileOrchestra(fullOrchestra);
-
-    if (!compileResult.success) {
-      throw new Error(compileResult.errorMessage || 'Compilation failed');
-    }
-
-    this.headerCompiled = true;
-
-    await csound.startPerformance();
-
-    if (score.trim()) {
-      await csound.readScore(score);
-    }
-  }
-
   private async evaluateBlock(csound: CsoundStore, code: string): Promise<void> {
-    const trimmedCode = code.trim();
+    const filteredCode = this.stripCommentLines(code);
 
-    if (!trimmedCode) return;
+    if (!filteredCode.trim()) return;
 
-    if (this.isScoreEvent(trimmedCode)) {
-      await csound.sendScoreEvent(trimmedCode);
+    if (this.isScoreEvent(filteredCode)) {
+      await csound.sendScoreEvent(filteredCode);
     }
-    else if (this.isInstrumentDefinition(trimmedCode)) {
-      await csound.compileOrchestra(trimmedCode);
-    }
-    else if (this.isChannelSet(trimmedCode)) {
-      await this.handleChannelSet(csound, trimmedCode);
+    else if (this.isChannelSet(filteredCode)) {
+      await this.handleChannelSet(csound, filteredCode);
     }
     else {
-      await csound.compileOrchestra(trimmedCode);
+      await csound.compileOrchestra(filteredCode);
     }
   }
 
-  private parseCSD(content: string): {
-    header: string;
-    instruments: string;
-    score: string
-  } {
-    const orcMatch = content.match(/<CsInstruments>([\s\S]*?)<\/CsInstruments>/);
-    if (!orcMatch) {
-      return { header: '', instruments: '', score: '' };
-    }
-
-    const orchestra = orcMatch[1].trim();
-
-    const scoMatch = content.match(/<CsScore>([\s\S]*?)<\/CsScore>/);
-    const score = scoMatch ? scoMatch[1].trim() : '';
-
-    const instrMatch = orchestra.match(/([\s\S]*?)(instr\s+\d+[\s\S]*)/);
-
-    if (instrMatch) {
-      return {
-        header: instrMatch[1].trim(),
-        instruments: instrMatch[2].trim(),
-        score
-      };
-    }
-
-    return {
-      header: orchestra,
-      instruments: '',
-      score
-    };
+  private stripCommentLines(code: string): string {
+    return code
+      .split('\n')
+      .filter(line => !line.trim().startsWith(';'))
+      .join('\n');
   }
 
   private isScoreEvent(code: string): boolean {
     return /^[ifea]\s+[\d\-]/.test(code);
   }
 
-  private isInstrumentDefinition(code: string): boolean {
-    return /^\s*instr\s+/.test(code);
-  }
-
   private isChannelSet(code: string): boolean {
     return /^\w+\s*=\s*[\d\.\-]+/.test(code);
   }
@@ -139,7 +83,6 @@ export class LiveCodingStrategy implements ExecutionStrategy {
 
   reset(): void {
     this.isInitialized = false;
-    this.headerCompiled = false;
   }
 }
 
diff --git a/src/lib/csound/store.ts b/src/lib/csound/store.ts
index a28bea7..47f0ea1 100644
--- a/src/lib/csound/store.ts
+++ b/src/lib/csound/store.ts
@@ -1,5 +1,5 @@
-import { writable, derived, get } from 'svelte/store';
-import { CsoundEngine, type InstanceMode, type PerformanceMetrics, type CompilationResult } from './engine';
+import { writable, derived } from 'svelte/store';
+import { CsoundEngine, type PerformanceMetrics, type CompilationResult } from './engine';
 
 export interface LogEntry {
   timestamp: Date;
@@ -21,9 +21,9 @@ export interface CsoundStore {
   startPerformance: () => Promise<void>;
   readScore: (score: string) => Promise<void>;
   sendScoreEvent: (event: string) => Promise<void>;
-  evaluate: (code: string, forceNewInstance?: boolean) => Promise<void>;
+  evaluate: (code: string) => Promise<void>;
   stop: () => Promise<void>;
-  reset: () => Promise<void>;
+  restart: () => Promise<void>;
   setControlChannel: (name: string, value: number) => Promise<void>;
   getControlChannel: (name: string) => Promise<number>;
   setStringChannel: (name: string, value: string) => Promise<void>;
@@ -41,7 +41,7 @@ export interface CsoundStore {
   destroy: () => Promise<void>;
 }
 
-export function createCsoundStore(instanceMode?: InstanceMode): CsoundStore {
+export function createCsoundStore(): CsoundStore {
   const initialState: CsoundState = {
     initialized: false,
     compiled: false,
@@ -76,8 +76,7 @@ export function createCsoundStore(instanceMode?: InstanceMode): CsoundStore {
           },
           onAnalyserNodeCreated: (node) => {
             analyserNodeListeners.forEach(listener => listener(node));
-          },
-          instanceMode
+          }
         });
 
         await engine.init();
@@ -140,13 +139,13 @@ export function createCsoundStore(instanceMode?: InstanceMode): CsoundStore {
       await engine.sendScoreEvent(event);
     },
 
-    async evaluate(code: string, forceNewInstance = false) {
+    async evaluate(code: string) {
       if (!engine) {
         throw new Error('Csound engine not initialized');
       }
 
       try {
-        await engine.evaluateCode(code, forceNewInstance);
+        await engine.evaluateCode(code);
         update(state => ({
           ...state,
           compiled: engine!.isCompiled(),
@@ -172,14 +171,14 @@ export function createCsoundStore(instanceMode?: InstanceMode): CsoundStore {
       }
     },
 
-    async reset() {
+    async restart() {
       if (!engine) return;
 
       try {
-        await engine.reset();
-        update(state => ({ ...state, compiled: false, running: false }));
+        await engine.restart();
+        update(state => ({ ...state, compiled: true, running: true }));
       } catch (error) {
-        const errorMsg = error instanceof Error ? error.message : 'Reset failed';
+        const errorMsg = error instanceof Error ? error.message : 'Restart failed';
         addLog(errorMsg, 'error');
       }
     },
diff --git a/src/lib/editor/block-eval.ts b/src/lib/editor/block-eval.ts
index a611ec8..40db108 100644
--- a/src/lib/editor/block-eval.ts
+++ b/src/lib/editor/block-eval.ts
@@ -80,14 +80,57 @@ export function getLine(state: EditorState): EvalBlock {
   return { text, from, to };
 }
 
+type BlockType = 'instr' | 'endin' | 'opcode' | 'endop' | null;
+
+function startsWithBlockMarker(text: string): BlockType {
+  const trimmed = text.trim();
+  if (/^\s*instr\b/.test(text)) return 'instr';
+  if (/^\s*endin\b/.test(text)) return 'endin';
+  if (/^\s*opcode\b/.test(text)) return 'opcode';
+  if (/^\s*endop\b/.test(text)) return 'endop';
+  return null;
+}
+
+function findBlockMarker(
+  doc: any,
+  startLine: number,
+  direction: number,
+  limit: number
+): [number, BlockType] | null {
+  for (let i = startLine; direction > 0 ? i <= limit : i >= limit; i += direction) {
+    if (i < 1 || i > doc.lines) break;
+    const lineText = doc.line(i).text;
+    const marker = startsWithBlockMarker(lineText);
+    if (marker) {
+      return [i, marker];
+    }
+  }
+  return null;
+}
+
 export function getBlock(state: EditorState): EvalBlock {
   let { doc, selection } = state;
   let { text, number } = state.doc.lineAt(selection.main.from);
 
   if (text.trim().length === 0) return { text: '', from: null, to: null };
 
-  let fromL, toL;
-  fromL = toL = number;
+  const prevBlockMark = findBlockMarker(doc, number, -1, 1);
+  const nextBlockMark = findBlockMarker(doc, number, 1, doc.lines);
+
+  if (
+    prevBlockMark &&
+    nextBlockMark &&
+    ((prevBlockMark[1] === 'instr' && nextBlockMark[1] === 'endin') ||
+      (prevBlockMark[1] === 'opcode' && nextBlockMark[1] === 'endop'))
+  ) {
+    const { from } = doc.line(prevBlockMark[0]);
+    const { to } = doc.line(nextBlockMark[0]);
+    text = state.doc.sliceString(from, to);
+    return { text, from, to };
+  }
+
+  let fromL = number;
+  let toL = number;
 
   while (fromL > 1 && doc.line(fromL - 1).text.trim().length > 0) {
     fromL -= 1;
diff --git a/src/lib/templates/template-registry.ts b/src/lib/templates/template-registry.ts
index fa9c34c..aa71685 100644
--- a/src/lib/templates/template-registry.ts
+++ b/src/lib/templates/template-registry.ts
@@ -71,19 +71,11 @@ const LIVECODING_TEMPLATE: CsoundTemplate = {
   id: 'livecoding',
   name: 'Live Coding',
   mode: 'livecoding',
-  content: `<CsoundSynthesizer>
-<CsOptions>
--odac
-</CsOptions>
-<CsInstruments>
-
-sr = 48000
-ksmps = 32
-nchnls = 2
-0dbfs = 1
-
-; Press Cmd/Ctrl+E on the full document first to initialize
-; Then evaluate individual blocks to trigger sounds
+  content: `; LIVE CODING MODE
+; Engine auto-initializes on first evaluation (Ctrl+E)
+; Evaluate instruments/opcodes with Ctrl+E to define them
+; Evaluate score events (i-statements) to trigger sounds
+; Press Ctrl+. to stop all audio
 
 gaReverb init 0
 
@@ -119,14 +111,12 @@ instr 99
   gaReverb = 0
 endin
 
-</CsInstruments>
-<CsScore>
+; Start reverb (always on)
 i 99 0 -1
-</CsScore>
-</CsoundSynthesizer>
 
 
-; LIVE CODING EXAMPLES
+; === LIVE CODING EXAMPLES ===
+; Select a block and press Ctrl+E to evaluate
 
 ; Basic note
 i 1 0 2 440 0.3
@@ -146,7 +136,7 @@ i 2 1.5 0.5 130.81 0.4
 ; Long note for channel control
 i 1 0 30 440 0.3
 
-; Change frequency while playing
+; Change frequency while playing (select and evaluate)
 freq = 440
 
 freq = 554.37