Sequential Prophet X - Envelope Parameters (Front Panel)

38 39Filter Envelope
Sequential Prophet X User’s Guide
Filter Envelope
To hear the effect of the Filter Envelope:
1. Press the global button and use Soft Knob 1 to navigate to the basic
program command, then press Soft Key 1 (write now).
2. Hold down a note and rotate the lter’s cutoff knob to set it to
a value of 40 (refer to the main display to see its numeric value).
3. Play a note. At this point you probably won’t hear anything because
you’ve closed the lter signicantly.
4. In the Envelopes section, turn the Filter Envelope’s env amount knob
to a value of 50 (refer to the main display to see its numeric value).
5. Play a note. Notice how the sound has changed. The Filter Envelope
is controlling lter cutoff by the amount you set with the env amount
knob.
6. Repeatedly strike a note on the keyboard as you turn the Filter Enve-
lope’s decay knob clockwise and counterclockwise. Notice how it
changes the sound as the note decays faster or slower.
7. Now experiment with the Filter Envelope’s attack knob. Notice how
the attack becomes faster or slower.
8. Now hold down a note and experiment with the Filter Envelope’s
sustain knob.
9. The Filter Envelope’s release parameter acts in conjunction with the
Amplier Envelope, so to hear its effect, rst set the Amp Envelope’s
release value to 75.
10. Now repeatedly strike a note on the keyboard as you turn the Filter
Envelope’s release knob clockwise and counterclockwise. Notice how
the note fades out faster or slower as you change the release value.
11. Continue experimenting with various Filter Envelope settings while
you adjust the Filter Envelope’s env amount knob. Notice how greater
env amount settings amplify the effect of the envelope on the lter.
As noted above, the Filter Envelope and Amplier Envelope often work
in conjunction, with the Filter Envelope controlling how the lter opens
and closes and the Amplier Envelope controlling how the Amplier
controls the overall volume shape of the sounds you create. To learn
more about the Amplier Envelope, see page 42.
Envelope Parameters (Front Panel)
Attack: 0...127—Sets the attack time of the envelope. The higher the
setting, the slower the attack time and the longer it takes for the lter to
open from the level set with the lter cutoff knob to the level set by the
lter envelope amount. Percussive sounds typically have sharp (short)
attacks.
Decay: 0...127—Sets the decay time of the envelope. After a sound
reaches the lter frequency set at its attack stage, decay controls how
quickly the lter then transitions to the cutoff frequency set with the
sustain knob. The higher the setting, the longer the decay. Percussive
sounds, such as synth bass, typically have shorter decays (and a generous
amount of low-pass lter resonance).
Sustain: 0...127—Sets the lter cutoff frequency for the sustained
portion of the sound. The sound will stay at this lter frequency for as
long as a note is held on the keyboard.
Release: 0...127—Sets the release time of the envelope. This controls
how quickly the lter closes after a note is released.
Velocity On/Off: On, Off—Allows key velocity to inuence lter cutoff
frequency. If on, the harder you play, the more the lter will open and the
brighter the sound will be. If off, key velocity will not affect the lter.
This control allows for more touch-sensitive sounds.
Env Amount: -127...127—Sets the amount of modulation from the lter
envelope to the lter’s cutoff frequency. Any setting above zero means
that each time you strike a key, the lter envelope controls how the lter
opens and closes. Higher amounts more dramatically affect the cutoff
frequency. This control is bipolar. Positive settings produce standard
behavior. Negative settings invert the envelope.