EMU procussion, Operation Manual

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36 Procussion operation manual
PROGRAMMING BASICS
Modulation
Procussion has an extensive modulation implementation using multi-
wave LFO’s (Low Frequency Oscillators), envelope generators and the
ability to respond to multiple MIDI controllers. You can simultaneously
route any combination of these control sources to multiple destinations.
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
Procussion 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 Procussion are
Envelope Generators and Low Frequency Oscillators . In the example above,
an envelope generator could be routed to automatically turn the volume
control as programmed 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.