diff --git a/apps/stage-tamagotchi/src/main/index.ts b/apps/stage-tamagotchi/src/main/index.ts
index bfcf8de60..b0116fc23 100644
--- a/apps/stage-tamagotchi/src/main/index.ts
+++ b/apps/stage-tamagotchi/src/main/index.ts
@@ -1,3 +1,5 @@
+import type { BrowserWindow } from 'electron'
+
 import { env, platform } from 'node:process'
 
 import { electronApp, optimizer } from '@electron-toolkit/utils'
@@ -77,6 +79,12 @@ app.whenReady().then(async () => {
 
   // BeatSync will create a background window to capture and process audio.
   const beatSync = injeca.provide('windows:beat-sync', () => setupBeatSync())
+  const beatSyncDispatchTo = injeca.provide('windows:beat-sync:dispatch-to', {
+    dependsOn: { beatSync },
+    build: async ({ dependsOn }) => (window: BrowserWindow) => {
+      return dependsOn.beatSync.dispatchTo(window)
+    },
+  })
 
   const chatWindow = injeca.provide('windows:chat', {
     dependsOn: { widgetsManager },
@@ -84,22 +92,16 @@ app.whenReady().then(async () => {
   })
 
   const settingsWindow = injeca.provide('windows:settings', {
-    dependsOn: { widgetsManager, beatSync },
-    build: async ({ dependsOn }) => async () => {
-      const { beatSync: _, ...setupArgs } = dependsOn
-      const window = await setupSettingsWindowReusableFunc(setupArgs)()
-      dependsOn.beatSync.dispatchTo(window)
-      return window
+    dependsOn: { widgetsManager, beatSync, beatSyncDispatchTo },
+    build: async ({ dependsOn }) => {
+      return setupSettingsWindowReusableFunc({ ...dependsOn, onWindowCreated: window => dependsOn.beatSyncDispatchTo(window) })
     },
   })
 
   const mainWindow = injeca.provide('windows:main', {
-    dependsOn: { settingsWindow, chatWindow, widgetsManager, noticeWindow, beatSync },
+    dependsOn: { settingsWindow, chatWindow, widgetsManager, noticeWindow, beatSync, beatSyncDispatchTo },
     build: async ({ dependsOn }) => {
-      const { beatSync: _, ...setupArgs } = dependsOn
-      const window = await setupMainWindow(setupArgs)
-      dependsOn.beatSync.dispatchTo(window)
-      return window
+      return setupMainWindow({ ...dependsOn, onWindowCreated: window => dependsOn.beatSyncDispatchTo(window) })
     },
   })
 
@@ -109,11 +111,8 @@ app.whenReady().then(async () => {
   })
 
   const tray = injeca.provide('app:tray', {
-    dependsOn: { mainWindow, settingsWindow, captionWindow, widgetsWindow: widgetsManager, beatSync, aboutWindow },
-    build: async ({ dependsOn }) => {
-      const { beatSync, aboutWindow, ...setupArgs } = dependsOn
-      return setupTray({ ...setupArgs, beatSyncBgWindow: beatSync.window, aboutWindow })
-    },
+    dependsOn: { mainWindow, settingsWindow, captionWindow, widgetsWindow: widgetsManager, beatSyncBgWindow: beatSync, aboutWindow },
+    build: async ({ dependsOn }) => setupTray(dependsOn),
   })
 
   injeca.invoke({
diff --git a/apps/stage-tamagotchi/src/main/tray/index.ts b/apps/stage-tamagotchi/src/main/tray/index.ts
index 4e8b5e89e..c35522d73 100644
--- a/apps/stage-tamagotchi/src/main/tray/index.ts
+++ b/apps/stage-tamagotchi/src/main/tray/index.ts
@@ -1,5 +1,6 @@
 import type { BrowserWindow } from 'electron'
 
+import type { setupBeatSync } from '../windows/beat-sync'
 import type { setupCaptionWindowManager } from '../windows/caption'
 import type { WidgetsWindowManager } from '../windows/widgets'
 
@@ -22,7 +23,7 @@ export function setupTray(params: {
   settingsWindow: () => Promise<BrowserWindow>
   captionWindow: ReturnType<typeof setupCaptionWindowManager>
   widgetsWindow: WidgetsWindowManager
-  beatSyncBgWindow: BrowserWindow
+  beatSyncBgWindow: Awaited<ReturnType<typeof setupBeatSync>>
   aboutWindow: () => Promise<BrowserWindow>
 }): void {
   once(() => {
@@ -53,7 +54,7 @@ export function setupTray(params: {
       ...is.dev || env.MAIN_APP_DEBUG || env.APP_DEBUG
         ? [
             { type: 'header', label: 'DevTools' },
-            { label: 'Troubleshoot BeatSync...', click: () => params.beatSyncBgWindow.webContents.openDevTools() },
+            { label: 'Troubleshoot BeatSync...', click: () => params.beatSyncBgWindow.window.webContents.openDevTools() },
             { type: 'separator' },
           ] as const // :(
         : [],
diff --git a/apps/stage-tamagotchi/src/main/windows/main/index.ts b/apps/stage-tamagotchi/src/main/windows/main/index.ts
index 585536ecb..a13d3804c 100644
--- a/apps/stage-tamagotchi/src/main/windows/main/index.ts
+++ b/apps/stage-tamagotchi/src/main/windows/main/index.ts
@@ -33,6 +33,7 @@ export async function setupMainWindow(params: {
   chatWindow: () => Promise<BrowserWindow>
   widgetsManager: WidgetsWindowManager
   noticeWindow: NoticeWindowManager
+  onWindowCreated?: (window: BrowserWindow) => void
 }) {
   const {
     setup: setupConfig,
@@ -64,6 +65,10 @@ export async function setupMainWindow(params: {
     ...transparentWindowConfig(),
   })
 
+  if (params.onWindowCreated) {
+    params.onWindowCreated(window)
+  }
+
   // NOTICE: in development mode, open devtools by default
   if (is.dev || env.MAIN_APP_DEBUG || env.APP_DEBUG) {
     try {
diff --git a/apps/stage-tamagotchi/src/main/windows/settings/index.ts b/apps/stage-tamagotchi/src/main/windows/settings/index.ts
index 0e19cf174..d61faa928 100644
--- a/apps/stage-tamagotchi/src/main/windows/settings/index.ts
+++ b/apps/stage-tamagotchi/src/main/windows/settings/index.ts
@@ -12,6 +12,7 @@ import { setupSettingsWindowInvokes } from './rpc/index.electron'
 
 export function setupSettingsWindowReusableFunc(params: {
   widgetsManager: WidgetsWindowManager
+  onWindowCreated?: (window: BrowserWindow) => void
 }) {
   return createReusableWindow(async () => {
     const window = new BrowserWindow({
@@ -26,6 +27,10 @@ export function setupSettingsWindowReusableFunc(params: {
       },
     })
 
+    if (params.onWindowCreated) {
+      params.onWindowCreated(window)
+    }
+
     window.on('ready-to-show', () => window.show())
     window.webContents.setWindowOpenHandler((details) => {
       shell.openExternal(details.url)