LethePlayer Pro

LethePlayer Pro — Audio Monitoring & Review Notes Outside the Studio

Trust your ears wherever you go. Designed specifically for out-of-studio monitoring, LethePlayer Pro strips away heavy editing tools to focus on one essential task: accurately reviewing mixes and logging revisions on the move. Return to your DAW with a clear, exact roadmap of what needs fixing.

■ Spot-Check, Mark & Fix Later
Instantly set markers and take notes at the exact timestamp and frequency where you spot an issue. Lightweight and fast on mobile—no need to rely on memory or vague text notes.

■ Seamless A/B Reference Switching
Open multiple mix versions in separate tabs with full playback synchronization. Switching tabs is instant with zero audio dropouts or position drift. Adjustable crossfade duration included.

■ Automatic LUFS Loudness Matching
Prevent the "louder is better" bias. Using BS.1770 K-weighting gated measurement, audio levels are normalized based on the quietest track. Gain offset is strictly capped below 0 dB to guarantee zero clipping.

■ Spectrogram & Band-pass Isolation
Pan and zoom freely across time and frequency axes. Drag over suspicious areas to isolate specific frequency bands (Pass) or notch them out (Invert) using steep FIR filters for surgical previewing.

■ Versatile Markers & History
Attach titles, colors, and detailed notes to specific timestamps or time regions. Full Undo/Redo support keeps your review session secure and easy to manage on mobile.

■ Real-Time Audio Analysis
Includes a peak-hold spectrum analyzer and a vectorscope for real-time visual inspection of stereo width and mono compatibility.

■ High-Res Visual Export
Export your current view as a crisp PNG image including time/frequency axes and marker notes. Perfect for sending precise visual feedback directly to clients or collaborators.

■ 100% On-Device Processing (Privacy First)
All decoding, FFT analysis, and loudness metering happen locally on your device. Your unreleased tracks are never uploaded to any server.
(※ Network connection is only used when importing files directly via 'Open in App' from letheaudio.com).

■ Multi-Language Support: English · Korean · Japanese

── Troubleshooting: Cannot See Your Markers? ──
For security and privacy, the app cannot access full local file paths. Files are identified by combining 'File Name + File Size'.
· Moving a file to a different folder will preserve all your markers.
· Renaming or re-saving a file (which changes its size) causes the app to recognize it as a new file.
· Your markers are not lost! Simply restore the original file name, and all markers will reappear instantly.