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Chapter 5: Oscillators and Filters
ANDROMEDA A6 REFERENCE MANUAL 105
TUNE Page Parameters: OSC 1 and OSC 2
Each oscillator has tuning knobs for coarse, fine and ultra-fine tuning control. These
three controls have their neutral positions (where A-440 or Standard Pitch is
achieved) at 12 o’clock. For each knob, its lowest frequency position is fully counter-
clockwise. As you turn a knob clockwise, its frequency increases. As you turn the
knob counter-clockwise, its pitch is lowered.
DISPLAY
PAGE PANEL LABEL
PARAMETER
DISPLAY
OPTIONS
or RANGE
DESCRIPTION
TUNE
OCT Panel LED
The OCT LED will light at each octave interval
as the
SEMITONE knob, described next, is used.
SEMITONE SEMI - 60 ··· 60
Coarse tuning is accomplished with the
SEMITONE knob. Turning this knob changes
the VCO’s frequency in precise semitone
increments over a ten octave range: five
octaves up or five octaves down from the 12
o’clock center position (A-440).
CENTS CENTS - 100 ··· 100
± 1 semitone
For more precise tuning, use the CENTS knob
or soft knob
2 below the display. The
frequency set by the
SEMITONE knob can be
fine tuned in cents. One cent is 1/100
th
of a
semitone.
FINE FINE - 100 ··· 100
± 1/10 semitone
Fine tuning is accomplished with the FINE
knob or soft knob 3 below the display. The
FINE parameter changes the oscillators’
frequency in millicents. A millicent is 1/10
th
of
a cent, or 1/1000
th
of a semitone.
·····
1PITCH OFF, ON
If a VCO is being used as a modulation
source, it may be necessary to keep its pitch at
one particular frequency no matter what note
or notes are being played. Turning this
parameter
ON will disable “keyboard
tracking” of the selected VCO so that the same
note is produced regardless of what keys (or
MIDI notes) are played. More on this function
in the next topic
OSC 1 FM Parameters.
SYNC
(OSC 2 only)
SYNC
OFF, SOFT,
HARD
An OSC 2 function only. See the expanded
discussion of this parameter beginning on
page 115.
When the TUNE page is selected for either oscillator, note that the screen displays “A4
equals XXX.XX Hz
.” Key “A4” is the third “A” key counting up from the bottom
(left side) of the keyboard. When the frequency shows 440.00 Hz, the A6 is tuned to
standard pitch.