APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Instrukcja Użytkownika Pobierz pdf (Strona 51)

4.4 The Play View 51

4.4.2 The Key Module

The Key module controls how the synthesizer voices respond to the events coming

from an external MIDI keyboard or from a MIDI sequencer.

The keyboard can be monophonic, allowing one to play only one note at a time,

or polyphonic, allowing one the play chords. This behavior is adjusted with the Mode

drop-down menu. The Priority control, located below the Mode control, sets the behav-

ior of the keyboard when several notes are depressed at the same time in monophonic

mode or when the maximum number of polyphonic voices has been reached in poly-

phonic mode. In monophonic mode, the Priority determines which of the lower, last, or higher note

has precedence when several notes are played. In polyphonic mode, this control determines which

of the lowest, highest, or oldest note is muted in order to replace it with the newest note played once

the maximum of polyphonic voices has been reached. Note that since this parameter determines

the note priority, the stolen note will be the opposite of what appears in the control display. The

Error knob adds a random error to the pitch of each note played; as it is turned clockwise, the error

increases. This makes all the notes play slightly out of tune.

Note that the sustain pedal (MIDI controller number 64) is always active on the Key module.

4.4.3 Unison

The unison mode allows one to stack voices, in other words, play two or

four voices for each note played on the keyboard. This mode creates the im-

pression that several instruments are playing the same note together, adding

depth to the sound.

Each voice can be slightly detuned relatively to the others by using the

Detune knob. Turning this knob clockwise increases the amplitude of the error.

Furthermore, voices can be desynchronized by adding a small time lag between

their triggering with the Delay knob. There is no delay when the knob is in its leftmost position

and it increases (units in ms) as it is turned clockwise.

4.4.4 The Glide Module

The Glide module is used to make the pitch slide between notes rather than chang-

ing immediately from note to note. The Time knob sets the amount of time necessary

for the pitch to slide over one octave. The Mode drop-down menu enables one to

choose between the Constant or Proportional mode. When in Constant mode, the

time necessary for the pitch to slide from one note to another is always the same re-

gardless of the interval between the notes. When set to proportional, the slide time

becomes proportional to the width of the interval between the two notes.

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