diff --git a/src/lib/csound/engine.ts b/src/lib/csound/engine.ts
index 2fa0913..0ff7054 100644
--- a/src/lib/csound/engine.ts
+++ b/src/lib/csound/engine.ts
@@ -1,23 +1,40 @@
 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 {
+  kperiodCount: number;
+  currentTime: number;
+  isRunning: boolean;
+}
+
+export interface CompilationResult {
+  success: boolean;
+  errorMessage?: string;
 }
 
 export class CsoundEngine {
   private csound: Csound | null = null;
   private initialized = false;
+  private compiled = false;
   private running = false;
   private options: CsoundEngineOptions;
   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> {
@@ -27,7 +44,98 @@ export class CsoundEngine {
     this.log('Csound ready');
   }
 
-  async evaluateCode(code: string): Promise<void> {
+  private async ensureCsoundInstance(): Promise<void> {
+    if (!this.csound) {
+      this.log('Creating Csound instance...');
+      this.csound = await Csound();
+      this.setupCallbacks();
+      await this.csound.setOption('-odac');
+    }
+  }
+
+  private setupCallbacks(): void {
+    if (!this.csound) return;
+
+    this.csound.on('message', (message: string) => {
+      this.options.onMessage?.(message);
+    });
+
+    this.csound.on('onAudioNodeCreated', (node: AudioNode) => {
+      this.audioNode = node;
+      this.audioContext = node.context as AudioContext;
+      this.log('Audio node created and captured');
+    });
+
+    this.csound.on('realtimePerformanceEnded', async () => {
+      this.running = false;
+      this.log('Performance complete');
+      this.options.onPerformanceEnd?.();
+    });
+  }
+
+  async compileOrchestra(orchestra: string): Promise<CompilationResult> {
+    if (!this.initialized) {
+      throw new Error('Csound not initialized. Call init() first.');
+    }
+
+    try {
+      await this.ensureCsoundInstance();
+
+      this.log('Compiling orchestra...');
+      const result = await this.csound!.compileOrc(orchestra);
+
+      if (result !== 0) {
+        const errorMsg = 'Orchestra compilation failed';
+        this.error(errorMsg);
+        return { success: false, errorMessage: errorMsg };
+      }
+
+      this.compiled = true;
+      this.log('Orchestra compiled successfully');
+      return { success: true };
+
+    } catch (error) {
+      const errorMsg = error instanceof Error ? error.message : 'Compilation failed';
+      this.error(errorMsg);
+      return { success: false, errorMessage: errorMsg };
+    }
+  }
+
+  async startPerformance(): Promise<void> {
+    if (!this.compiled) {
+      throw new Error('No orchestra compiled. Call compileOrchestra() first.');
+    }
+
+    if (this.running) {
+      this.log('Already running');
+      return;
+    }
+
+    this.log('Starting performance...');
+    await this.csound!.start();
+    this.running = true;
+    this.setupAnalyser();
+    this.log('Performance started');
+  }
+
+  async readScore(score: string): Promise<void> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    this.log('Reading score...');
+    await this.csound.readScore(score);
+  }
+
+  async sendScoreEvent(event: string): Promise<void> {
+    if (!this.running) {
+      throw new Error('Csound not running. Call startPerformance() first.');
+    }
+
+    await this.csound!.readScore(event);
+  }
+
+  async evaluateCode(code: string, forceNewInstance = false): Promise<void> {
     if (!this.initialized) {
       throw new Error('Csound not initialized. Call init() first.');
     }
@@ -37,32 +145,21 @@ 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();
+      }
+
       this.scopeNode = null;
 
-      this.log('Creating new Csound instance...');
-      this.csound = await Csound();
-
-      this.csound.on('message', (message: string) => {
-        this.options.onMessage?.(message);
-      });
-
-      this.csound.on('onAudioNodeCreated', (node: AudioNode) => {
-        this.audioNode = node;
-        this.audioContext = node.context as AudioContext;
-        this.log('Audio node created and captured');
-      });
-
-      this.csound.on('realtimePerformanceEnded', async () => {
-        try {
-          await this.csound?.cleanup();
-        } catch {}
-        this.running = false;
-        this.log('Performance complete');
-        this.options.onPerformanceEnd?.();
-      });
-
-      this.log('Setting audio output...');
-      await this.csound.setOption('-odac');
+      await this.ensureCsoundInstance();
 
       const orcMatch = code.match(/<CsInstruments>([\s\S]*?)<\/CsInstruments>/);
       const scoMatch = code.match(/<CsScore>([\s\S]*?)<\/CsScore>/);
@@ -74,42 +171,125 @@ export class CsoundEngine {
       const orc = orcMatch[1].trim();
       const sco = scoMatch[1].trim();
 
-      this.log('Compiling orchestra...');
-      const compileResult = await this.csound.compileOrc(orc);
-
-      if (compileResult !== 0) {
-        throw new Error('Failed to compile orchestra');
+      const compileResult = await this.compileOrchestra(orc);
+      if (!compileResult.success) {
+        throw new Error(compileResult.errorMessage || 'Compilation failed');
       }
 
-      this.log('Reading score...');
-      await this.csound.readScore(sco);
-
-      this.log('Starting performance...');
-      this.running = true;
-      await this.csound.start();
-
-      this.setupAnalyser();
+      await this.readScore(sco);
+      await this.startPerformance();
 
     } catch (error) {
       this.running = false;
-      if (this.csound) {
-        try {
-          await this.csound.cleanup();
-        } catch {}
-      }
+      this.compiled = false;
       const errorMsg = error instanceof Error ? error.message : 'Evaluation failed';
       this.error(errorMsg);
       throw error;
     }
   }
 
+  async setControlChannel(name: string, value: number): Promise<void> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    await this.csound.setControlChannel(name, value);
+  }
+
+  async getControlChannel(name: string): Promise<number> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    return await this.csound.getControlChannel(name);
+  }
+
+  async setStringChannel(name: string, value: string): Promise<void> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    await this.csound.setStringChannel(name, value);
+  }
+
+  async getStringChannel(name: string): Promise<string> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    return await this.csound.getStringChannel(name);
+  }
+
+  async getTable(tableNumber: number): Promise<Float32Array> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    return await this.csound.getTable(tableNumber);
+  }
+
+  async setTable(tableNumber: number, data: Float32Array | number[]): Promise<void> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+
+    const tableData = data instanceof Float32Array ? data : new Float32Array(data);
+    await this.csound.setTable(tableNumber, tableData);
+  }
+
+  async getPerformanceMetrics(): Promise<PerformanceMetrics> {
+    if (!this.csound) {
+      return {
+        kperiodCount: 0,
+        currentTime: 0,
+        isRunning: this.running
+      };
+    }
+
+    try {
+      const currentTime = await this.csound.getCurrentTimeSamples();
+
+      return {
+        kperiodCount: 0,
+        currentTime: currentTime / (await this.csound.getSr()),
+        isRunning: this.running
+      };
+    } catch (error) {
+      return {
+        kperiodCount: 0,
+        currentTime: 0,
+        isRunning: this.running
+      };
+    }
+  }
+
+  async getSampleRate(): Promise<number> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+    return await this.csound.getSr();
+  }
+
+  async getKsmps(): Promise<number> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+    return await this.csound.getKsmps();
+  }
+
+  async getOutputChannelCount(): Promise<number> {
+    if (!this.csound) {
+      throw new Error('No Csound instance available');
+    }
+    return await this.csound.getNchnls();
+  }
+
   async stop(): Promise<void> {
     if (!this.csound || !this.running) return;
 
     try {
-      this.log('Stopping...');
+      this.log('Stopping performance...');
       await this.csound.stop();
-      await this.csound.cleanup();
       this.running = false;
       this.log('Stopped');
     } catch (error) {
@@ -118,6 +298,49 @@ 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;
+
+    try {
+      if (this.running) {
+        await this.csound.stop();
+      }
+      await this.csound.cleanup();
+    } catch (error) {
+      console.error('Cleanup error:', error);
+    } finally {
+      this.csound = null;
+      this.running = false;
+      this.compiled = false;
+    }
+  }
+
   isRunning(): boolean {
     return this.running;
   }
@@ -126,6 +349,10 @@ export class CsoundEngine {
     return this.initialized;
   }
 
+  isCompiled(): boolean {
+    return this.compiled;
+  }
+
   getAudioContext(): AudioContext | null {
     return this.audioContext;
   }
@@ -166,10 +393,7 @@ export class CsoundEngine {
   }
 
   async destroy(): Promise<void> {
-    if (this.running) {
-      await this.stop();
-    }
-    this.csound = null;
+    await this.cleanupInstance();
     this.initialized = false;
   }
 }
diff --git a/src/lib/csound/index.ts b/src/lib/csound/index.ts
index 0e676ee..eaae68b 100644
--- a/src/lib/csound/index.ts
+++ b/src/lib/csound/index.ts
@@ -1,4 +1,9 @@
 export { CsoundEngine } from './engine';
-export type { CsoundEngineOptions } from './engine';
+export type {
+  CsoundEngineOptions,
+  InstanceMode,
+  PerformanceMetrics,
+  CompilationResult
+} from './engine';
 export { createCsoundStore, createCsoundDerivedStores } from './store';
 export type { LogEntry, CsoundStore } from './store';
diff --git a/src/lib/csound/store.ts b/src/lib/csound/store.ts
index 2d7dbac..a28bea7 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 } from './engine';
+import { CsoundEngine, type InstanceMode, type PerformanceMetrics, type CompilationResult } from './engine';
 
 export interface LogEntry {
   timestamp: Date;
@@ -9,6 +9,7 @@ export interface LogEntry {
 
 interface CsoundState {
   initialized: boolean;
+  compiled: boolean;
   running: boolean;
   logs: LogEntry[];
 }
@@ -16,8 +17,23 @@ interface CsoundState {
 export interface CsoundStore {
   subscribe: (run: (value: CsoundState) => void) => () => void;
   init: () => Promise<void>;
-  evaluate: (code: string) => Promise<void>;
+  compileOrchestra: (orchestra: string) => Promise<CompilationResult>;
+  startPerformance: () => Promise<void>;
+  readScore: (score: string) => Promise<void>;
+  sendScoreEvent: (event: string) => Promise<void>;
+  evaluate: (code: string, forceNewInstance?: boolean) => Promise<void>;
   stop: () => Promise<void>;
+  reset: () => Promise<void>;
+  setControlChannel: (name: string, value: number) => Promise<void>;
+  getControlChannel: (name: string) => Promise<number>;
+  setStringChannel: (name: string, value: string) => Promise<void>;
+  getStringChannel: (name: string) => Promise<string>;
+  getTable: (tableNumber: number) => Promise<Float32Array>;
+  setTable: (tableNumber: number, data: Float32Array | number[]) => Promise<void>;
+  getPerformanceMetrics: () => Promise<PerformanceMetrics>;
+  getSampleRate: () => Promise<number>;
+  getKsmps: () => Promise<number>;
+  getOutputChannelCount: () => Promise<number>;
   clearLogs: () => void;
   getAudioContext: () => AudioContext | null;
   getAnalyserNode: () => AnalyserNode | null;
@@ -25,9 +41,10 @@ export interface CsoundStore {
   destroy: () => Promise<void>;
 }
 
-export function createCsoundStore(): CsoundStore {
+export function createCsoundStore(instanceMode?: InstanceMode): CsoundStore {
   const initialState: CsoundState = {
     initialized: false,
+    compiled: false,
     running: false,
     logs: []
   };
@@ -54,9 +71,13 @@ export function createCsoundStore(): CsoundStore {
         engine = new CsoundEngine({
           onMessage: (msg) => addLog(msg, 'info'),
           onError: (err) => addLog(err, 'error'),
+          onPerformanceEnd: () => {
+            update(state => ({ ...state, running: false }));
+          },
           onAnalyserNodeCreated: (node) => {
             analyserNodeListeners.forEach(listener => listener(node));
-          }
+          },
+          instanceMode
         });
 
         await engine.init();
@@ -72,20 +93,70 @@ export function createCsoundStore(): CsoundStore {
       }
     },
 
-    async evaluate(code: string) {
+    async compileOrchestra(orchestra: string): Promise<CompilationResult> {
       if (!engine) {
-        throw new Error('CSound engine not initialized');
+        throw new Error('Csound engine not initialized');
       }
 
       try {
+        const result = await engine.compileOrchestra(orchestra);
+        update(state => ({ ...state, compiled: result.success }));
+        return result;
+      } catch (error) {
+        const errorMsg = error instanceof Error ? error.message : 'Compilation failed';
+        addLog(errorMsg, 'error');
+        throw error;
+      }
+    },
+
+    async startPerformance() {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+
+      try {
+        await engine.startPerformance();
         update(state => ({ ...state, running: true }));
-        await engine.evaluateCode(code);
+      } catch (error) {
+        const errorMsg = error instanceof Error ? error.message : 'Failed to start performance';
+        addLog(errorMsg, 'error');
+        throw error;
+      }
+    },
+
+    async readScore(score: string) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+
+      await engine.readScore(score);
+    },
+
+    async sendScoreEvent(event: string) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+
+      await engine.sendScoreEvent(event);
+    },
+
+    async evaluate(code: string, forceNewInstance = false) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+
+      try {
+        await engine.evaluateCode(code, forceNewInstance);
+        update(state => ({
+          ...state,
+          compiled: engine!.isCompiled(),
+          running: engine!.isRunning()
+        }));
       } catch (error) {
         const errorMsg = error instanceof Error ? error.message : 'Evaluation failed';
         addLog(errorMsg, 'error');
+        update(state => ({ ...state, compiled: false, running: false }));
         throw error;
-      } finally {
-        update(state => ({ ...state, running: false }));
       }
     },
 
@@ -101,6 +172,88 @@ export function createCsoundStore(): CsoundStore {
       }
     },
 
+    async reset() {
+      if (!engine) return;
+
+      try {
+        await engine.reset();
+        update(state => ({ ...state, compiled: false, running: false }));
+      } catch (error) {
+        const errorMsg = error instanceof Error ? error.message : 'Reset failed';
+        addLog(errorMsg, 'error');
+      }
+    },
+
+    async setControlChannel(name: string, value: number) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      await engine.setControlChannel(name, value);
+    },
+
+    async getControlChannel(name: string): Promise<number> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getControlChannel(name);
+    },
+
+    async setStringChannel(name: string, value: string) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      await engine.setStringChannel(name, value);
+    },
+
+    async getStringChannel(name: string): Promise<string> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getStringChannel(name);
+    },
+
+    async getTable(tableNumber: number): Promise<Float32Array> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getTable(tableNumber);
+    },
+
+    async setTable(tableNumber: number, data: Float32Array | number[]) {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      await engine.setTable(tableNumber, data);
+    },
+
+    async getPerformanceMetrics(): Promise<PerformanceMetrics> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getPerformanceMetrics();
+    },
+
+    async getSampleRate(): Promise<number> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getSampleRate();
+    },
+
+    async getKsmps(): Promise<number> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getKsmps();
+    },
+
+    async getOutputChannelCount(): Promise<number> {
+      if (!engine) {
+        throw new Error('Csound engine not initialized');
+      }
+      return await engine.getOutputChannelCount();
+    },
+
     clearLogs() {
       update(state => ({
         ...state,
@@ -142,6 +295,7 @@ export function createCsoundDerivedStores(csound: CsoundStore) {
   return {
     logs: derived(csound, $csound => $csound.logs),
     initialized: derived(csound, $csound => $csound.initialized),
+    compiled: derived(csound, $csound => $csound.compiled),
     running: derived(csound, $csound => $csound.running)
   };
 }