Sound Lock — Support

Sound Lock is a tiny macOS menu-bar utility that locks your preferred audio input / output / system output and quietly switches them back whenever macOS auto-flips to a wrong device (most commonly when a Bluetooth headset’s microphone forces playback into low-quality HFP/SCO).

  • System requirements: macOS 14.0+, Apple Silicon or Intel
  • App Sandbox: enabled
  • Data collection: none — see the Privacy Policy

Quick start

  1. After installing, look for the speaker-shaped icon in the top-right menu bar (Sound Lock has no Dock icon — that’s by design)
  2. Click the icon → Preferences to open the main window
  3. In Device Lock → Input (or Output), click the lock icon next to a device to make it your preferred device
  4. macOS will now auto-revert to that device within ~0.4 seconds whenever something else takes over

Sound Lock Pro

Free tier: up to 2 device locks total across input + output. Lock a 3rd device to trigger the Pro upgrade sheet.

Sound Lock Pro is a one-time purchase (Non-Consumable IAP) that unlocks unlimited device locks. The same Apple ID restores it on any of your Macs.

FAQ

Q: Why doesn’t the menu bar icon appear after install?
On macOS Tahoe (26+), third-party menu bar items need explicit permission. Open System Settings → Control Center → Menu Bar and make sure Sound Lock is allowed.

Q: Does Sound Lock record audio?
No. Sound Lock only calls the public CoreAudio HAL API to change the default device selection. It never opens an audio stream, never accesses the microphone, never analyzes audio.

Q: Bluetooth headset still drops to low quality during video calls — does Sound Lock help?
Yes — that’s exactly what it was built for. Lock your AirPods (or any A2DP-capable output) as the preferred output, and lock the laptop’s built-in microphone as the preferred input. When Zoom / Teams / Meet try to switch your headset’s mic on, Sound Lock will switch the system mic back to built-in within a fraction of a second, keeping the headset in A2DP for high-quality playback.

Q: My device disappeared from the priority list.
Cached display names are kept across reboots, so an unplugged device should remain visible (greyed out). If it’s completely gone, the macOS audio system may have forgotten its UID — reconnect once and it will reappear.

Q: How do I restore my Pro purchase on a new Mac?
Open Preferences → Upgrade Pro → Restore Purchases. Make sure you’re signed in to the App Store with the same Apple ID.

Contact

Bug reports, feature requests, or anything else: oldcai.com@gmail.com

Sound Lock — 支持

Sound Lock 是一个常驻 macOS 菜单栏的小工具，记住你想要的麦克风 / 耳机 / 音箱，每当 macOS 把默认输入或输出”乱切”到其他设备时，Sound Lock 会在不到半秒内自动切回。

  • 系统要求：macOS 14.0+，Apple Silicon 或 Intel
  • App Sandbox：已开启
  • 数据收集：无 — 详见 隐私政策

快速上手

  1. 安装后在屏幕右上角 菜单栏 找喇叭样图标（Sound Lock 没有 Dock 图标，这是设计）
  2. 点击图标 → 偏好设置 打开主窗口
  3. 在 设备锁定 → 输入（或输出）tab 中，点击设备旁的锁定图标
  4. 此后每当 macOS 切到其他设备，Sound Lock 会在 ~0.4 秒内切回你锁定的设备

Sound Lock Pro

免费版：输入 + 输出 总共最多锁定 2 个设备。锁第 3 个时会触发 Pro 升级弹窗。

Sound Lock Pro 是一次买断（Non-Consumable IAP），解锁不限数量的设备锁。同一个 Apple ID 可以在你的多台 Mac 上恢复购买。

常见问题

菜单栏没看到图标？
macOS Tahoe (26+) 起第三方菜单栏项需要额外授权。打开 系统设置 → 控制中心 → 菜单栏，确保 Sound Lock 在允许列表里。

Sound Lock 会录音吗？
不会。Sound Lock 只调用 macOS 公开的 CoreAudio HAL API 切换 默认设备选择，从不打开音频流，从不访问麦克风，从不分析音频。

蓝牙耳机开会时还是会掉到低音质，Sound Lock 能解决吗？
能 —— 这正是它设计的初衷。把 AirPods（或任何支持 A2DP 的输出）锁为优先输出，把笔记本内置麦克风锁为优先输入。当 Zoom / Teams / Meet 试图切换到耳机麦克风时，Sound Lock 会在不到半秒内把系统麦克风切回内置麦克风，保持耳机停留在 A2DP 高音质播放。

设备从优先列表里消失了？
缓存的显示名跨重启保留，断开的设备应仍然可见（灰显）。如果完全消失，可能是 macOS 音频系统忘记了它的 UID —— 重连一次就会重新出现。

新 Mac 上怎么恢复 Pro 购买？
打开 偏好设置 → 升级 Pro → 恢复购买，确保你在 App Store 登录的是同一个 Apple ID。

联系

Bug 反馈、功能建议、任何问题：oldcai.com@gmail.com

Related Posts