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9 - Synthesizer Basics
Modulation
Volume
Turning the volume control back and forth on your home stereo is an example of Amplitude
Modulation.
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. Positive modulation Adds to the initial amount. Negative
modulation Subtracts from the initial amount.
Modulation Sources
The main modulation sources are Envelope Generators, Performance Controllers and
Low Frequency Oscillators. In the previous example, 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 turn the volume control up and down in a
repeating fashion. The main mod sources are listed below.
Keyboard Key
Which key is pressed.
Key Velocity
How fast the key is pressed.
Release Velocity
How fast the key is released.
Gate
High if the key is pressed, low when the key is released.
Key Glide
A smoothly changing control source based on the Glide Rate and the interval between
the last two notes played.
Pitch and Mod Wheels
Keyboard pitch bend and modulation wheels.
Keyboard Pressure (mono aftertouch)
Key Pressure applied after the key is initially pressed.
Pedal
A continuously variable pedal controller connected to your MIDI keyboard.
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Proteus X Operation Manual
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