EG attack time.
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. Additional information based on testing by paulfd:
…it matches “well enough” with a multiplicatively to be a close match with a multiplicatively decreasing curve from 1.0 towards 0.0005 (which is around -33 dB). The step is where
numis the number of samples of the ramp. The full formula for the curve would be .
The decay stage is also multiplicative but the ramp does not seem to follow the same law with
target=sustain, but rather something strange like where the actual envelope would be .
Here is a screenshot of a file output using Sforzando, showing the ampeg_envelope shape and its stages.
|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|
- Envelope: X
- LFO: X
- MIDI CC:
- ampeg_attackccN (SFZ v1), alias ampeg_attack_onccN (SFZ v2)
- ampeg_vel2attack (SFZ v1)