An Android audio recording and playback application with two coexisting architectures: a legacy Java MVP system (V1) and a modern Kotlin Compose MVVM system (V2). The app supports recording in M4A/AAC, WAV, and 3GP formats with configurable sample rate, bitrate, channel count, and audio source. It features waveform visualization during recording and playback, file management (rename, bookmark, trash, import/export), broken-record recovery, and a customizable name-format builder. The V2 codebase uses Jetpack Compose, Hilt dependency injection, Room database, ExoPlayer, and coroutines, while V1 uses Android Views, SQLite, and manual DI. The dual-codebase design adds complexity and maintenance risk, but the V2 components are well-architected with a clean unidirectional data flow and reusable patterns for media handling and UI state management. The project has extensive localization (18 locales), fastlane metadata for Play Store, and a custom home-screen widget.