APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario descargar pdf (Pagina 44)

4.8 The Keyboard Module 44

4.8 The Keyboard Module

The Keyboard module controls how the synthesizer voices respond

to the events coming from an external MIDI keyboard or from a MIDI

sequencer.

The ﬁrst row of controls (Tuning, Octave, Semi) is used to ﬁx the

pitch of the keyboard, and transpose the overall keyboard by octaves

or semi-tones. The Stretch and Error knobs, on the bottom row, allow

one to stretch the octaves and/or add a random error on each note played.

The second line of parameters allows one to turn unison on or off, select polyphonic or monophonic

mode of operation, and choose the note priority. The ﬁrst two knobs on the third row, Detune and

Decay, are used to set the detune amount and the time delay respectively between voices of a note

when the Unison mode is selected.

Note that the sustain pedal (MIDI controller number 64) is always active on the Keyboard

module.

4.8.1 Tuning

The pitch of A4 (normally 440 Hz) is adjusted, in Hertz, in the Tuning display. The pitch can be

transposed by −3 to +3 octaves and −12 to +12 semi-tones by using the Octave and Semi drop-

down menus. Once the tuning of the keyboard has been determined trough the use of these three

controls, one can slightly alter it with the Stretch and the Error knobs. The Stretch knob sets the

value of a semi-tone. When in the center position, the semi-tone interval corresponds to that of the

equal-tempered scale. Turning the knob to the left shrinks the interval while turning it to the right

increases it. The main effect of the Stretch control is that when it is not in the center position, an

interval of one octave will not sound perfectly in tune and therefore beating will be heard when

playing perfect octaves. The Error knob adds a random error to each note played; the more the

knob is turned clockwise, the larger is the error. This will make all the notes play slightly out of

tune.

4.8.2 Mode and Priority

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 on the right of the Mode control, sets the behavior 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 polyphonic 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

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APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario Pagina 44