Manual AAS Chromaphone (page 29 of 45) (English)

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4.7 The Vibrato Module 29

is divided into four phases, the Attack, Decay, Sustain and Release controlled by the A, D, S and R

controls respectively.

During the attack phase, the envelope signal goes from a value of zero to a value of 1 in a laps

of time controlled by the A knob. The decay phase then begins and the signal goes from 1 to the

sustain value of the signal in a laps of time controlled by the D knob. The level of the sustain

portion of the modulation signal is adjusted using the S knob. This value is held as long as a note

is depressed. Upon release of the note, the signal then decreases from its sustain value to zero in

a laps of time controlled by the R knob. The Delay knob of this module is used to add a delay

between the triggering of a note and the start of the envelope. This is useful to add noise to the

excitation signal following the initial impact noise from the Mallet module.

attack decay release

sustain

key pressed key released

1Volt

Figure 10: ADSR Response curve.

4.7 The Vibrato Module

A vibrato effect is equivalent to a periodic low frequency pitch modu-

lation. This effect is generally obtained by using an LFO to modulate the

pitch signal of a signal generator. In Chromaphone, a dedicated module is

provided for this effect.

The Rate knob sets the frequency of the vibrato effect from 0.5 Hz to 5 Hz. The Amnt knob sets

the depth of the effect, or in other words the amplitude of the frequency variations. In its leftmost

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AAS Chromaphone Manual

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