# ampeg_attack

EG attack time.

## Examples #

```
ampeg_attack=1.2
fileg_attack=0.1
```

## Practical Considerations #

These are very frequently used, especially with amplifier envelopes.
`ampeg_attack`

is the standard “A” in the basic ADSR volume envelope.
`fileg_attack`

is key to 303-style basses.

In ARIA, the SFZ1 envelopes have linear attack (for `pitcheg`

and `fileg`

,
probably linear in cents, which won’t translate into linear in Hertz).
Decay and release stages have a curve which is faster than linear, and it
seems to match “well enough” with a multiplicatively decreasing curve.
The step size should be close to
\(\mu = \exp \left( - \frac{8.0}{t \times s} \right)\)
where \(t\) is the decay duration in seconds, and \(s\) is the sample rate in Hertz.
The envelope \(x_{n+1}\) at index \(n+1\) is thus computed as
\(x_{n+1} = \mu \times x_{n}.\)

Here is a screenshot of a file output using Sforzando, showing the ampeg_envelope shape and its stages.

Name | Version | Type | Default | Range | Unit |
---|---|---|---|---|---|

ampeg_attack | SFZ v1 | float | 0 | 0 to 100 | seconds |

Modulations | |||||

ampeg_attackccN | float | 0 | -100 to 100 | seconds | |

ampeg_attack_curveccN | ARIA | integer | 0 | 0 to 255 | |

ampeg_vel2attack | float | 0 | -100 to 100 | seconds |

Category: Modulation, Envelope Generators