Anki add-on: Karo Magic Audio Accelerator - Batch-speed up audio files / Auto-update card

Supercharge your flashcard reviews by automatically speeding up your slow audio files! Are you tired of sluggish Text-to-Speech (TTS) voices or long native audio clips slowing down your Anki sessions? When you are trying to review hundreds of cards a day, waiting for a slow audio file to finish playing can completely disrupt your workflow. Karo Magic Audio Accelerator is a lightning-fast, lightweight tool that completely automates the process of speeding up your audio. Pick your desired speed, and the add-on will instantly batch-process your files, replace them on your cards, and save you hours of review time. What it does This add-on searches for cards you've recently added or edited, extracts the audio files, and speeds them up by your chosen multiplier (e.g., 1.90x). It automatically edits the Anki card HTML to point to the newly accelerated file, deletes the old slow file to save space, and ensures your audio is perfectly synced across all your devices. Features Zero Setup Required: Works right out of the box on Windows and macOS. No extra downloads, no complicated paths, no FFmpeg required. Smart Preview: Not sure which speed multiplier sounds best? Click the Preview button to instantly generate and play a temporary preview of the most recent audio file in your selection. Dynamic Card Counter: Always know exactly what you are modifying. As you select "Today's Cards", pick a specific Deck, or type a Custom Search, a real-time counter tells you exactly how many cards you are about to process. Double-Speed Protection (Safe): The add-on is completely idiot-proof. It automatically detects files that have already been accelerated (e.g., _1.90x.wav ) and skips them, ensuring you never accidentally speed up a file twice. Remember Your Speed: Found the perfect tempo? Click "Save Default" and Anki will remember your exact speed multiplier for all future sessions. How to use Open Anki and go to the top menu bar: Tools > Karo Magic Audio Accelerator... A dialog will appear. Choose which cards you want to process: Cards added or edited TODAY (Perfect for running right after generating TTS!) All cards in a specific Deck Custom Search (For Anki power users) Set your Audio Speed Multiplier (e.g., 1.90x). (Optional) Click "▶ Preview (Newest File)" to test how the speed sounds. Click "Process Entire Batch" . The add-on will speed up the audio, convert the files to universally supported .WAV format, update your cards, and clean up the old files! Compatibility: Fully tested and working on modern Anki versions, including Anki 25.09+ (Qt6 / Python 3.13). Fully compatible with Windows and macOS. Created by Karo Magic If you find this add-on helpful for your language learning or medical studies, consider supporting my work! Donations are greatly appreciated and help me keep creating free tools. Support & Feedback: I am always open to suggestions and improvements. Feel free to open an issue or share your feature requests directly on GitHub .

GitHub repository: stiansci/karo_magic_audio_accelerator
Repository description: Anki add-on utilizing Anki's native mpv engine to batch-accelerate audio files. Automatically updates card HTML and cleans up old media with zero external dependencies.
Languages: Python
Topics: add-on, anki, ankiaddon, audio-processing, mpv