🎵 Audio Transpose

Change the key of your audio in real-time while preserving chord notation and playback quality.

How to Use:

• Step 1: Analyze your audio to detect the original key
• Step 2: Select a target key from the Transpose dropdown (e.g., C, D, D#)
• Step 3: Watch the progress indicator (0%-100%) as audio is processed
• Step 4: When complete, play the high-quality transposed audio
• Reset: Click the Reset button to return to the original key

Features:

• ✅ Real-time progress: Track processing status with live percentage updates
• ✅ High-quality audio: Optimized pitch shifting preserves rhythm and transients
• ✅ Chord synchronization: All chord labels update automatically to match the new key
• ✅ Key detection: Original key is auto-detected during analysis
• ✅ Instant switching: Previously transposed keys are cached for quick re-selection

Technical Details:

• Range: Transpose up to ±12 semitones (one octave)
• Processing time: Real-time, no processing delay
• Quality: Uses SoundTouch JS AudioWorklet with WSOLA algorithm for tempo-preserving pitch shift
• Caching: Transposition is applied live in the browser's Web Audio graph; no server processing or rendering required