Voltage controlled oscillators vco 1 – Analogue Solutions Telemark /-K User Manual
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analogue Solution – Telemark – 2014
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Voltage Controlled Oscillators VCO 1
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 VCO1. Use this to
tune VCO1 to your other instruments or VCO2.
TUNE:
Controls the course pitch of VCO1. Range is about +/- 2
octaves. Use this to tune VCO1 to your other instruments or to shift
the VCO pitch up or down an octave compared to VC02
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 (which can be used for creative
effect!). Turn this knob anti-clockwise in increasing amounts to
apply frequency modulation (FM) to VCO1.
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
(which
can be used for creative effect!).