Drag a WAV file onto the drop zone, or click to browse. The waveform displays immediately. The start marker is placed automatically at the zero crossing before the first audible transient, and BPM is detected in the background.
Waveform display
Drag the orange markers to set in/out points. Drag between markers to move the selection. Scroll to zoom in/out, or use + / − buttons. Drag the gray scrollbar below the waveform to pan when zoomed. The teal region is what will be processed.
Snap to zero default on
When enabled, markers snap to the nearest zero crossing as you drag — the point where the waveform crosses silence. This prevents clicks and pops at the start and end of a cropped sample.
Crop
Trims the sample to the selected region. In BPM mode enter a tempo and bar count — the end marker is calculated automatically for a precise loop length (4/4 time). Drag markers manually to override; the badge switches to Manual.
Timestretch
Changes tempo without affecting pitch. Enter the original and target BPM, then choose an algorithm. OLA — fast, works well on rhythmic loops. WSOLA — searches for the best overlap each frame; better transient handling, good all-rounder. Phase Vocoder — frequency-domain; best for sustained tonal & melodic content, may smear transients.
Speed / File Size
Increases playback rate by 1×–4×. The sample plays back faster and higher in pitch on the device, but the file is proportionally smaller. At 2× the WAV is ~50% smaller; at 4× ~75% smaller. Ideal for saving space on the EP-133.
Channels
Convert stereo to mono to halve the file size. Choose the left or right channel, or L+R merge (averaged). Stereo samples remain stereo by default.
Processing order
The pipeline always runs in this fixed order: Crop → Timestretch → Speed → Channels. Click Process to apply all enabled steps, then Download WAV to save the result as a 16-bit PCM file.