PROGRAMMING BASICS
28
Proteus operation manual
Modulation
Proteus has an extensive modulation implementation using two multi-
wave LFO’s (Low Frequency Oscillators), two envelope generators and
the ability to respond to multiple MIDI controllers. You can simultane-
ously route any combination of these control sources to multiple destina-
tions.
MODULATION
Modulation means to
dynamically change
a parameter, whether it be the
volume (amplitude modulation), the pitch (frequency modulation), or
whatever. Turning the volume control on your home stereo rapidly back
and forth would be an example of amplitude modulation. To modulate
something we need a modulation
source
and a modulation
destination.
The source is your hand turning the knob, and the destination is the
volume control. If we had a device that would automatically turn the
volume control, we would also call that device a modulation source. The
Proteus is designed so that for each of the variable parameters, such as the
volume, there is an initial setting which can be changed by a modulation
source. Therefore in the case of volume, we have an initial volume and we
can change or modulate that volume with a modulation source. Two
main types of modulation sources on the Proteus are
Envelope Generators
and
Low Frequency Oscillators
. In the example above, an envelope genera-
tor could be routed to automatically turn the volume control as pro-
grammed by the envelope. Or, a low frequency oscillator could be routed
to automatically turn the volume control up and down in a repeating
fashion.
Turning the volume control back and forth on your home stereo is an example of Amplitude Modulation.
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