# Vibrato

Add pitch vibrato to oscillator sounds.

## Basic Vibrato

```forth
"lead" s
  60 note
  5 vib        ( vibrato rate in Hz )
  0.5 vibmod   ( vibrato depth )
.
```

## Vibrato Shape

Control the LFO waveform:

```forth
"pad" s
  c4 note
  4 vib
  0.3 vibmod
  0 vibshape   ( 0=sine, other values for different shapes )
.
```

## Subtle vs Expressive

```forth
( subtle vibrato for pads )
"pad" s 3 vib 0.1 vibmod .

( expressive vibrato for leads )
"lead" s 6 vib 0.8 vibmod .
```

## Words

| Word | Stack | Description |
|------|-------|-------------|
| `vib` | (f --) | Set vibrato rate (Hz) |
| `vibmod` | (f --) | Set vibrato depth |
| `vibshape` | (f --) | Set vibrato LFO shape |