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MSBuild

LangSoundTSF

Windows provides various ways to add audible feedback for state toggles (Caps Lock, Num Lock, etc.), but it does not provide a built-in sound for input language switching in multilingual setups. This project fills that gap by playing a short sound when the active input language changes.

LangSoundTSF is a Windows Text Services Framework (TSF) text service that plays a short sound when the current input language changes.

The service compares the currently active keyboard layout language with the system default input language:

  • If the active language is not the default input language, it plays NonDefault.wav.
  • If the active language is the default input language, it plays Default.wav.

The WAV files are embedded into the DLL as resources.

Requirements

  • Windows 10/11 x64
  • Visual Studio 2022 (C++23)

Build

Open LangSoundTSF.sln in Visual Studio and build the Release | x64 configuration.

Install (register)

Registration requires administrative privileges because TSF TIP registration writes under HKLM\SOFTWARE\Microsoft\CTF\TIP.

  1. Get the source code:

    • Clone:

      git clone https://github.com/svtv/LangSoundTSF.git

    • Or download a ZIP archive from the GitHub repository page.

  2. Build the DLL (see the Build section).

  3. From an elevated Command Prompt, register the DLL:

C:\Windows\System32\regsvr32.exe "full\path\to\LangSoundTSF.dll"

Uninstall (unregister)

From an elevated Command Prompt:

C:\Windows\System32\regsvr32.exe /u "full\path\to\LangSoundTSF.dll"

Notes

  • This project is an in-process COM server (TSF text service). The DLL may stay loaded while referenced by TSF-enabled processes.
  • If you modify embedded sounds, rebuild the DLL so resources are updated.
  • Known limitation: does not work in Windows Terminal (the TSF text service is not loaded by Terminal, so activation notifications are not received).