E-Mu ProteusX, Operation Manual

Page: 95 / 188

6 - Voice Editor / Synthesizer Level
Modulation Cords
E-MU Systems 95
Modulation Source Polarity
On a few of the modulation sources you’ll see the following suffixes: +, ~,<. These
designate the polarity of the modulation source. A plus (+) means that the source goes
from zero to maximum value. The (~) symbol indicates that the source is bidirectional.
In the case of an LFO, the LFO would go both positive and negative, centering on the
zero line. The (<) symbol indicates that the source only subtracts from the initial value
of a destination. This type of control is designed to be used for velocity-to-volume
control where you want to keep as much headroom as possible. The following chart
shows the three types of polarity.
Summing Nodes
All the modulation inputs on Proteus X are summing nodes. This means that you can
connect as many modulation sources as you want to an input
(such as Pitch or AmpVol).
Modulation sources are simply added algebraically — connecting two knobs one set to -
100 and the other set to +100 yields a net value of zero.
PatchCord Lore
•
Real-time events happen first on lower numbered Cords, so it is usually a good
idea to put important functions on lower numbered cords and to place compo-
nents of complex modulations patches in the proper order in the Cords section.
•
Negative Cord amounts invert envelopes and LFO waveforms.
•
To invert the effect of a controller knob, set its Cord to -100 and add DC with a
Cord value of +100.
+
~
+
modulation ADDS to the
initial value. (Normal)
<
modulation SUBTRACTS
from the initial value
~
centers around Zero.
(Use for LFOs, Filt. Freq.)
Control
Value
Control Value Applied
0 127
63
0 127 63
-63 +64
0
-127 0 -63
<