Main features and operation23
LFOs
LFOs
There are two LFOs - Low Frequency Oscillators - available.
These produce regular electronic variations which are too low
to be heard when converted into audio vibrations. They can be
used to modify various elements of the sound, producing regu-
lar changes in pitch (vibrato), pulse width or filter Cut off.
LFO Select Switch
Selects which LFO the Speed, Delay and waveform controls
relate to. Select position 1 for LFO 1 and 2 for LFO 2.
Speed Knob
Controls the speed of the low frequency Oscillations. An LED
directly below the knob indicates the speed. Faster speeds are
set by turning the knob clockwise. These are suitable for vibrato
and tremolo effects. Slower speeds are more appropriate for
Pulse Width changes or special effects.
Delay Knob
Controls how long after the note is struck the selected LFO
begins to take effect. Fully anticlockwise and the selected LFO
effect will begin immediately. Turning clockwise it will introduce
a time delay before the LFO effect can be heard. This is partic-
ularly useful for delayed vibrato effects.
Shape - Switch
Selects the waveform shape for the selected LFO.
S/H - Sample & Hold. At a regular interval (governed by the
Speed knob), the level of the LFO jumps to a new random level
and stays there until the next jump. This creates a rhythmic
effect particularly if routed to the Filter Cut off. Routing this to
pitch gives a less musical result, but is useful for computer or
machinery sound effects.
TRI -Triangle waveform gives the smoothest continuous change
in level to the LFO. When routed to pitch, it introduces vibrato
or a siren effect dependent of its speed setting. When routed to
Filter Cut off, a Wow Wow effect results.
SAW - Sawtooth waveform generates a falling level which then
jumps back up to full level. Routed to the Filter Cut off, it pro-
duces a rhythmic pulse effect. Routing it to pitch produces siren
type sounds.
SQR - Square waveform changes level instantly from minimum
to maximum. This waveform is useful for trills and computer
game effects.
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