# Pitch Envelope

Control pitch modulation over time with a dedicated ADSR envelope.

## Envelope Amount

```forth
"bass" s 0.5 penv .   ( pitch envelope depth )
"bass" s -0.5 penv .  ( negative envelope )
```

## Envelope Shape

```forth
"kick" s
  1.0 penv     ( full envelope depth )
  0.001 patt   ( instant attack )
  0.1 pdec     ( fast decay )
  0 psus       ( no sustain )
  0.1 prel     ( short release )
.
```

## Classic Kick Drum

```forth
"sine" s
  40 note
  2.0 penv
  0.001 patt
  0.05 pdec
  0 psus
.
```

## Words

| Word | Stack | Description |
|------|-------|-------------|
| `penv` | (f --) | Set pitch envelope amount |
| `patt` | (f --) | Set pitch attack time |
| `pdec` | (f --) | Set pitch decay time |
| `psus` | (f --) | Set pitch sustain level |
| `prel` | (f --) | Set pitch release time |