# Echo

Trails · slit-scan · time

Echo shows your picture as it was a moment ago, laid over the picture now. Moves leave ghost copies behind, freeze into a row of poses, stretch through time row by row, or split into color. Space repeats the frame itself, so it works on a still picture too.

## Controls

### Mode

- **Mode** (Select: Trails / Strobe / Slit-scan / RGB split / Space). **Trails** fades copies of the last moments in behind the picture. **Strobe** holds each copy still and jumps it forward in steps. **Slit-scan** gives each row or column its own moment. **RGB split** shows red now and green and blue a beat behind. **Space** repeats this very frame outward.

### Trail

- **Copies** (Knob, 2 to 12, rests at 5). How many copies, from 2 to 12.
- **Reach** (hero knob, 0.10s to 2.00s, rests at 0.57s). The hero. How far back the copies reach, from a tenth of a second to two seconds. In Slit-scan it's how much time the frame spans, edge to edge.
- **Fade** (Knob, 0 to 100, rests at 45). How quickly older copies fade away.
- **Moving only** (Knob, 0 to 100, rests at 0). Copies only show where something moved, so a still background doesn't double up.

### Look

- **Blend** (Select: Over / Behind / Screen / Lighten / Difference). How copies land. **Over** lays them on top, **Behind** tucks them under the picture (for logos and text with no background), **Screen** and **Lighten** glow, **Difference** inverts where they overlap.
- **Color** (Select: Source / Tint / Rainbow / Fade out / Negative). The copies' color. **Source** keeps it, **Tint** washes them in one hue, **Rainbow** steps each copy round the color wheel, **Fade out** drains the older ones, **Negative** inverts them.
- **Hue** (Knob, 0° to 360°, rests at 198°). The tint, or where the rainbow starts.

### Slit

- **Direction** (Select: Top down / Bottom up / Left to right / Right to left / From center). Which way time runs in Slit-scan: top down, bottom up, left to right, right to left, or from the center out.
- **Bend** (Knob, 0 to 100, rests at 50). Bends the time map, so more of the frame stays near now or near the past.
- **Wave** (Knob, 0 to 100, rests at 0). A slow wave through the slit, moving with the loop.

### Space

- **Step** (Knob, 0 to 100, rests at 35). How far each Space copy steps.
- **Angle** (Knob, 0° to 360°, rests at 270°). Which way the Space copies step.
- **Scale** (Knob, 80% to 120%, rests at 100%). Each Space copy's size against the one before. Under 100% shrinks into the frame, over 100% grows out of it.
- **Turn** (Knob, -30° to 30°, rests at 0°). How far each Space copy turns.
- **Sway** (Knob, 0 to 100, rests at 0). The Space copies sway with the loop.

### Mix

- **Mix** (Knob, 0 to 100, rests at 100). How much of the echo shows over the picture.

### Buttons

- **Burst** (Pulse button). Press for a moment of full-strength copies.

## Presets

- **Ghost Walk**: See-through copies trailing every move, only where something moves.
- **Freeze Frames**: Copies that hold still and jump forward in steps, like the ghost trick.
- **Light Painting**: Long glowing trails where bright things move, the rest stays dark.
- **Rainbow Trail**: Each copy a step further round the color wheel, trailing whatever moves.
- **Time Ribbon**: Slit-scan: the top of the frame is now, the bottom is a second ago.
- **Melt Clock**: Slit-scan from the center out, with a slow wave through the rings of time.
- **RGB Ghost**: Red now, green and blue a beat behind: moving edges split into color.
- **Infinity Mirror**: Copies shrinking back into the frame, fading as they go. On a logo or text with no background, set Blend to Behind.
- **Spin Echo**: Copies stepping out and turning, swaying with the loop.