TextToWav

A small C# WinForms application that lets you preview text with different Text-To-Speech voices, and save the output as a WAV file.

Features

• Preview entered text using SAPI/OneCore voices
• Adjust speech rate, volume, and pitch
• Save the result as a .wav file

Requirements

• Windows
• .NET Framework 4.7.2 or newer installed
• Visual Studio 2022/2026, or MSBuild, to build from source
• At least one installed text-to-speech voice

Voice support

This app supports two Windows voice systems:

• Classic SAPI voices through System.Speech.Synthesis
• Windows / OneCore voices through Windows.Media.SpeechSynthesis, when available

Windows / OneCore support is optional. If the newer speech API is unavailable on a system, the app falls back to SAPI voices only.

Voices are prefixed in the dropdown with [SAPI] or [Windows] depending on which engine the voice comes from.

Pitch is applied differently depending on the engine:

• SAPI voices use generated SSML with a numerical semitone pitch value, such as +3st or -3st.
• Windows / OneCore voices use the native AudioPitch option.

Some voices may interpret pitch differently or ignore it.

Project structure

Program.cs                        Application startup
MainForm.cs                       WinForms UI and event handling
Models/SpeechVoice.cs             Voice model used by the UI and services
Models/SpeechVoiceType.cs         SAPI / Windows / header enum
Models/SpeechSettings.cs          Rate, volume, and pitch settings
Services/VoiceCatalog.cs          Voice discovery and optional OneCore fallback
Services/SpeechPreviewService.cs  Preview playback and cancellation
Services/SpeechExportService.cs   WAV export for SAPI and Windows voices
Utilities/WinRtStreamHelper.cs    WinRT stream-to-byte-array helper
Utilities/WindowsSoundIcon.cs     Finds a Windows audio-related icon for the form

Building in Visual Studio

1. Open TextToWav.slnx in Visual Studio.
2. Restore NuGet packages if prompted.
3. Select Release configuration.
4. Build the project.
5. The executable will be created in bin\Release.