diff --git a/packages/asset-manager/test/asset-manager.library.spec.ts b/packages/asset-manager/test/asset-manager.library.spec.ts
index 8d00c257..fb7c566b 100644
--- a/packages/asset-manager/test/asset-manager.library.spec.ts
+++ b/packages/asset-manager/test/asset-manager.library.spec.ts
@@ -1,16 +1,13 @@
-import {
-  ApplicationContext,
-  type IConfigRegistry,
-  InitContext,
-  LibraryManager,
-} from "@nanoforge/common";
+import { type IConfigRegistry, InitContext } from "@nanoforge/common";
+import { EditableApplicationContext } from "@nanoforge/core/src/common/context/contexts/application.editable-context";
+import { EditableLibraryManager } from "@nanoforge/core/src/common/library/manager/library.manager";
 
 import { AssetManagerLibrary } from "../src";
 
 describe("Asset Manager Library", () => {
   const library = new AssetManagerLibrary();
-  const appContext = new ApplicationContext();
-  const libraryManager = new LibraryManager();
+  const libraryManager = new EditableLibraryManager();
+  const appContext = new EditableApplicationContext(libraryManager);
   const configRegistry = {} as IConfigRegistry;
   const context = new InitContext(appContext, libraryManager, configRegistry, {
     // @ts-ignore
diff --git a/packages/asset-manager/test/tsconfig.json b/packages/asset-manager/test/tsconfig.json
index 50d59661..36a47190 100644
--- a/packages/asset-manager/test/tsconfig.json
+++ b/packages/asset-manager/test/tsconfig.json
@@ -1,3 +1,10 @@
 {
-  "extends": "../../../tsconfig.spec.json"
+  "extends": "../../../tsconfig.spec.json",
+  "compilerOptions": {
+    "paths": {
+      "@nanoforge/common": ["./packages/common"],
+      "@nanoforge/core": ["./packages/core"],
+      "@nanoforge/core/*": ["./packages/core/*"]
+    }
+  }
 }
diff --git a/packages/common/src/context/contexts/application.context.ts b/packages/common/src/context/contexts/application.context.ts
index a1955f34..8bdd2f81 100644
--- a/packages/common/src/context/contexts/application.context.ts
+++ b/packages/common/src/context/contexts/application.context.ts
@@ -1,4 +1,4 @@
-export class ApplicationContext {
+export abstract class ApplicationContext {
   private _isRunning: boolean = false;
 
   get isRunning(): boolean {
@@ -8,4 +8,6 @@ export class ApplicationContext {
   setIsRunning(value: boolean): void {
     this._isRunning = value;
   }
+
+  abstract muteSoundLibraries(): void;
 }
diff --git a/packages/core/src/application/application-config.ts b/packages/core/src/application/application-config.ts
index 8419e60b..57f2f5c6 100644
--- a/packages/core/src/application/application-config.ts
+++ b/packages/core/src/application/application-config.ts
@@ -86,8 +86,4 @@ export class ApplicationConfig {
   public useMusicLibrary(library: IMusicLibrary) {
     this._libraryManager.setMusic(library);
   }
-
-  public getMutableLibraries() {
-    return this._libraryManager.getMutableLibraries();
-  }
 }
diff --git a/packages/core/src/application/nanoforge-application.ts b/packages/core/src/application/nanoforge-application.ts
index bc8e5888..4891178a 100644
--- a/packages/core/src/application/nanoforge-application.ts
+++ b/packages/core/src/application/nanoforge-application.ts
@@ -1,5 +1,4 @@
 import {
-  ApplicationContext,
   type IAssetManagerLibrary,
   type IComponentSystemLibrary,
   type ILibrary,
@@ -7,6 +6,7 @@ import {
   type IRunOptions,
 } from "@nanoforge/common";
 
+import { EditableApplicationContext } from "../common/context/contexts/application.editable-context";
 import { Core } from "../core/core";
 import { ApplicationConfig } from "./application-config";
 import type { IApplicationOptions } from "./application-options.type";
@@ -43,7 +43,10 @@ export abstract class NanoforgeApplication {
   }
 
   public init(options: IRunOptions): Promise<void> {
-    this._core = new Core(this.applicationConfig, new ApplicationContext());
+    this._core = new Core(
+      this.applicationConfig,
+      new EditableApplicationContext(this.applicationConfig.libraryManager),
+    );
     return this._core.init(options, this._options);
   }
 
diff --git a/packages/core/src/common/context/contexts/application.editable-context.ts b/packages/core/src/common/context/contexts/application.editable-context.ts
index 6288f1a1..91087bcd 100644
--- a/packages/core/src/common/context/contexts/application.editable-context.ts
+++ b/packages/core/src/common/context/contexts/application.editable-context.ts
@@ -1,3 +1,16 @@
 import { ApplicationContext } from "@nanoforge/common";
 
-export class EditableApplicationContext extends ApplicationContext {}
+import { type EditableLibraryManager } from "../../library/manager/library.manager";
+
+export class EditableApplicationContext extends ApplicationContext {
+  private _libraryManager: EditableLibraryManager;
+
+  constructor(libraryManager: EditableLibraryManager) {
+    super();
+    this._libraryManager = libraryManager;
+  }
+
+  muteSoundLibraries(): void {
+    this._libraryManager.getMutableLibraries().forEach((lib) => lib.library.mute());
+  }
+}
diff --git a/packages/core/src/core/core.ts b/packages/core/src/core/core.ts
index b487ed59..d8fbb1b0 100644
--- a/packages/core/src/core/core.ts
+++ b/packages/core/src/core/core.ts
@@ -57,13 +57,6 @@ export class Core {
     const intervalHandle = setInterval(render, 1000 / this.options.tickRate);
   }
 
-  /**
-   * mutes / unmutes mutable libraries all at once.
-   */
-  public mute(): void {
-    this.config.getMutableLibraries().map((x) => x.library.mute());
-  }
-
   private getInitContext(options: IRunOptions): InitContext {
     return new InitContext(this.context, this.config.libraryManager, this._configRegistry, options);
   }
diff --git a/packages/ecs/test/ecs-library.spec.ts b/packages/ecs/test/ecs-library.spec.ts
index 58b6b088..4b7714b6 100644
--- a/packages/ecs/test/ecs-library.spec.ts
+++ b/packages/ecs/test/ecs-library.spec.ts
@@ -1,10 +1,6 @@
 import { AssetManagerLibrary } from "@nanoforge/asset-manager";
-import {
-  ApplicationContext,
-  ClearContext,
-  type IConfigRegistry,
-  InitContext,
-} from "@nanoforge/common";
+import { ClearContext, type IConfigRegistry, InitContext } from "@nanoforge/common";
+import { EditableApplicationContext } from "@nanoforge/core/src/common/context/contexts/application.editable-context";
 import { EditableLibraryManager } from "@nanoforge/core/src/common/library/manager/library.manager";
 import { type ECSRegistry } from "@nanoforge/ecs";
 import { ECSLibrary } from "@nanoforge/ecs/src/ecs-library";
@@ -24,8 +20,8 @@ describe("ECSLibrary", () => {
   let ecs: ECSLibrary;
   let registry: ECSRegistry;
   const assetManager = new AssetManagerLibrary();
-  const appContext = new ApplicationContext();
   const libraryManager = new EditableLibraryManager();
+  const appContext = new EditableApplicationContext(libraryManager);
   const configRegistry = {} as IConfigRegistry;
   const initContext = new InitContext(appContext, libraryManager, configRegistry, {
     // @ts-ignore
diff --git a/packages/graphics-2d/test/graphics-2d.library.spec.ts b/packages/graphics-2d/test/graphics-2d.library.spec.ts
index 0846aa83..ed17cb93 100644
--- a/packages/graphics-2d/test/graphics-2d.library.spec.ts
+++ b/packages/graphics-2d/test/graphics-2d.library.spec.ts
@@ -1,16 +1,13 @@
-import {
-  ApplicationContext,
-  type IConfigRegistry,
-  InitContext,
-  LibraryManager,
-} from "@nanoforge/common";
+import { type IConfigRegistry, InitContext } from "@nanoforge/common";
+import { EditableApplicationContext } from "@nanoforge/core/src/common/context/contexts/application.editable-context";
+import { EditableLibraryManager } from "@nanoforge/core/src/common/library/manager/library.manager";
 
 import { Graphics2DLibrary } from "../src/graphics-2d.library";
 
 describe("Graphics 2D Library", () => {
   const library = new Graphics2DLibrary();
-  const appContext = new ApplicationContext();
-  const libraryManager = new LibraryManager();
+  const libraryManager = new EditableLibraryManager();
+  const appContext = new EditableApplicationContext(libraryManager);
   const configRegistry = {} as IConfigRegistry;
   const context = new InitContext(appContext, libraryManager, configRegistry, {
     // @ts-ignore
diff --git a/packages/graphics-2d/test/tsconfig.json b/packages/graphics-2d/test/tsconfig.json
index e756f496..0a8e84d4 100644
--- a/packages/graphics-2d/test/tsconfig.json
+++ b/packages/graphics-2d/test/tsconfig.json
@@ -1,6 +1,11 @@
 {
   "extends": "../../../tsconfig.spec.json",
   "compilerOptions": {
-    "types": ["jest", "node", "@webgpu/types"]
+    "types": ["jest", "node", "@webgpu/types"],
+    "paths": {
+      "@nanoforge/common": ["./packages/common"],
+      "@nanoforge/core": ["./packages/core"],
+      "@nanoforge/core/*": ["./packages/core/*"]
+    }
   }
 }