User Manual

Table Of Contents

(EG Amount Continued)

The depth of the Envelope effect on the Cutoff frequency also depends a lot on the CUTOFF setting.

If the setting is very high and you adjust the EG AMOUNT to raise it further, then the Envelope will have

little effect. The lower the Cutoff frequency, then the more the Envelope will be able to modulate it.

On the other hand, if the setting is very low and you adjust the EG AMOUNT to lower it further by

turning the knob counterclockwise, again, the Envelope will have little effect.

KB AMOUNT: Rotating this knob will specify to what extent the Filter Cutoff frequency tracks the

keyboard; that is, how much the keyboard pitch affects the Filter lowpass frequency. With KB AMOUNT

turned up halfway, the Filter cutoff will follow the keyboard pitch at a 1:1 ratio centered around middle C

(MIDI note 60). KB AMOUNT at maximum sets a 2:1 ratio for Filter keyboard tracking.

ENVELOPES

When you make any sound, it may take

a moment for that sound to reach its

maximum amplitude and brightness.

This initial moment is called the sound’s

attack. An attack may be gradual (like a

cymbal roll), abrupt (like a cymbal crash),

or anything in between. The attack often

tells us more about how an instrument

is played than any other characteristic.

Likewise, when the sound ends, it may

take a moment to die away completely,

or it may stop suddenly. This ﬁnal drop

in amplitude and brightness is called its

release. The attack and release, along with

variations in amplitude and timbre that

occur between the attack and release,

make up the sound’s Envelope.

Subsequent 25 shapes electronic

sounds using two Envelope Generators

(abbreviated EG). One envelope affects

the Subsequent 25 Filter, which controls

timbre, and the other affects its Ampliﬁer, which controls amplitude. When you press a key on the

keyboard, it sends a signal that tells the Envelope Generator to begin the Attack Stage. In voltage-

controlled synthesizers like Subsequent 25, this signal is called a Gate. The Gate ends when you release

the key, telling the Envelope Generator to begin the Release Stage.

Each of the Subsequent 25 Envelope Generators has four stages: Attack, Decay, Sustain, and Release

(abbreviated ADSR). Just as Attack is the time it takes a level to peak, the Decay is the time it takes

to fall to a steady level, called the Sustain. The Sustain Level is held until the note ends. At that point,

the signal returns to zero at a rate determined by the Release setting. Whereas the Attack, Decay, and

Release Stages are speciﬁed as lengths of time, Sustain is a control-signal level.

FILTER (Continued)