Athletes’ companion: adds synthesized voice overlay with various info and on-going timer to your audio files.

Features:

• Automatic voice volume adjustment based on music file volume
• Supports batch processing of multiple files
• Features dry-run mode for quick tests
• Highly customizable
• Minimal runtime dependencies
• Works on Linux, Mac OS and Windows
• Free

github.com/MarcinOrlowski/Mp3VoiceStamp