Alesis ANDROMEDA A6 Reference Manual page 108

Chapter 5: Oscillators and Filters
WAVE Page Parameters
DISPLAY
PAGE PANEL LABEL
WAVE
SQR
Button + LED
PULSE WIDTH
—
SAW
Button + LED
TRI
Button + LED
SINE
Button + LED
—
Selecting Waveforms
When editing an existing Program or creating a new one, one of the key issues in
determining what the final program will sound like is what waveform is selected in
each VCO. Both
so our discussion here covers both VCOs.
Selecting a waveform is as simple as pressing the button next to its panel label. Each
VCO can have a different waveform and more than one waveform can be activated
on each VCO. You can have all four waves on at the same time, for example.
The
SAW
a few controls not found on the
repeatedly toggles between
Referring again to Chapter 3, a positive sawtooth corresponds to the Up Saw wave
and a negative sawtooth corresponds to the Down Saw.
The
SQR
page is being displayed) that varies its duty cycle. At its fully counter-clockwise
position, the duty cycle is 0% producing that "nasal" sound we described in Chapter
3 on page 83. Turning the knob clockwise, the midpoint is 50%, producing a
traditional square wave that we described as "hollow" sounding. As the knob is
turned clockwise from the midpoint, the duty cycle begins to narrow again until the
knob reaches its full clockwise position, producing a 100% pulse width, also "nasal"
sounding but with different harmonics than the pulse widths below 50%.
106
PARAMETER OPTIONS
DISPLAY or RANGE DESCRIPTION
SQUARE OFF, ON
WIDTH 0 ··· 1 00
0 ··· 1 00
LEVEL
SAW OFF, POS,
Sawtooth
TRI OFF, ON
Triangle
SINE OFF, ON
FILTFM OFF, ON
Filter Frequency
Modulation
Output
and have identical functions for producing waveforms
OSC 1 OSC 2
and (square wave, which is the pulse wave set to 50%) waveforms have
SQR
SINE
(positive) and
POS
wave employs a
PULSE WIDTH
Turns the Square Wave on or off.
This parameter sets the width of the Square Wave.
When the parameter above is on, the graphic
SQR
display depicting the Pulse Width will change
when you turn the
knob .
2
Sets the output level of the
this is the only waveform that has a level control.
The others are either on (full output) or off.
This parameter turns the Sawtooth wave output
of the selected VCO to
NEG
(negative) or off.
This parameter turns the Triangle wave output of
the selected VCO on or off.
This parameter turns the Sine wave output of the
selected VCO on or off.
This parameter turns the oscillator's send to the
FM modulation of the filter section on or off. This
Filter FM output goes to the Filter section's
parameter as the
SRC
129). This is used if you want to use FM to
modulate the filter with the oscillator output.
or (triangle wave). Pressing the
TRI
(negative) sawtooth waves.
NEG
knob (duplicated on soft knob 2 when this
A A6 R
NDROMEDA
control or soft
PULSE WIDTH
wave. Note that
SQR
POS (positive), NEG
CV
source (see page
FILTFM
button
SAW
M
EFERENCE ANUAL