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ampeg_attack

EG attack time.

Examples #

ampeg_attack=1.2
fileg_attack=0.1

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.

DAHDSR envelope shape image

Name Version Type Default Range Unit
ampeg_attack SFZ v1 float 0 0 to 100 seconds
ampeg_attackccN SFZ v1 float 0 -100 to 100 seconds
ampeg_vel2attack SFZ v1 float 0 -100 to 100 seconds

Modulation Sources

  • Envelope: X
  • LFO: X
  • MIDI CC:
    • ampeg_attackccN (SFZ v1), alias ampeg_attack_onccN (SFZ v2)
  • Velocity:
    • ampeg_vel2attack (SFZ v1)

Category: Modulation, Envelope Generators