Analyze a track locally, mark sections, retime its arrangement, and preview supported edits before exporting.
Choose or drop an audio file. Your browser decodes it and estimates tempo and key locally. If the tempo is unknown, CineBeat does not invent a 120 BPM grid. Type a BPM and press Use BPM before retiming. Musical fit arranges by bars. Exact length is available only when that arrangement is already within 5% of the target. WAV and MP3 are the safest choices; M4A support depends on the browser. Use the original source player to find section times.
To split a track, add your fal.ai API key and press Separate Stems. This is a billable cloud request. The returned vocal, drum, bass, guitar/piano, and other stems appear as Dialogue, Percussion, Low End, Harmonics, and Atmosphere. Those names are grouping labels. A vocal stem is not treated as proven dialogue. Each row shows a waveform and has playback mix controls. If a directive fails, the mix returns to the state from before that apply.
Name non-overlapping source ranges with start and end times. Mark both a source and destination before asking to move one: “Move the marked Chorus before Verse 2.” “Make the marked Bridge darker” applies a 2,500 Hz low-pass filter. CineBeat does not identify sections for you. Retime and marked-section edits are separate timeline modes; reset timeline edits before switching between them.
Add your OpenAI API key for billable directive interpretation. Interpret Directive previews supported retime, stem mix, and marked-section actions. Read the proposal and select actions before Apply Selected. Revise the text to discard the old proposal and interpret again. Unsupported requests remain visible but cannot be applied. A standalone Retime button works without an OpenAI key.
Export WAV downloads the current master as 16-bit PCM. Once stems are separated, it includes the current gain, mute, and solo mix. Download All starts a separate WAV download for each stem, aligned to the current timeline but at full stem level so you can remix in an NLE or DAW. Your browser may ask permission for multiple downloads.
