Analogue Solution – Telemark-k – 2012
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Voltage Controlled Oscillators VCO 2
The voltage controlled oscillators (VCOs 1 and 2) produce the raw audio waveform usually used as the initial source
for sound creation. They provide cyclic audio waveforms that can be pitched. VCOs usually receive treatment from
the VCF to turn their basic tones into pleasant sounds.
FINE TUNE
:
Controls fine pitch adjustment of VCO2. Use this
to tune VCO1 to your other instruments or VCO1.
TUNE:
Controls the course pitch of VCO1. Range is about +/-
2 octaves. Use this to tune VCO2 to your other instruments or to
shift the VCO pitch up or down an octave compared to VC01
MODULATION:
This controls the amount of modulation to
either pulse width or pitch from the modulation source selected
by the SOURCE switch.
Turn this knob clockwise in increasing amounts to apply pulse
width modulation (PWM) to the square wave. This will have the
effect of thickening up the VCO sound. Extreme settings of
modulation may result in the sound cutting out.. Turn this knob
anti-clockwise in increasing amounts to apply frequency
modulation (FM) to VCO2. Use this for vibrato and trill effects on
the pitch.
In a central position, there will be no modulation to either PW or
Frequency
MODULATION SOURCE
rotary switch: This selects the
modulation source for either PWM or FM and is routed to the
control above.
The source options are;
EG2
for pitch sweeps. Good for percussion sounds
EXT2
for sound effects and additional modulation
LFO
for vibrato and trill effects
VCO1
Square wave
for frequency modulation effects
PULSE WIDTH:
This control allows manual shaping of the
pulse wave output. It alters the pulse width (duty cycle) of the
pulse wave. In a central position a square wave is produced (50%
duty cycle). Try this control and listen to how the tone of the
waveform changes. When using Pulse Width Modulation, it is
best to set the Pulse Width control to centre, otherwise the
sound may cut-out.
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