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EXi: MOD-7 Waveshaping VPM Synthesizer
Program P8: EG 1–9
The MOD-7 has nine assignable EGs, in addition to the Amp
EG. Each of these can be used as an AMS modulation source
to control a wide variety of parameters.
By default, EGs 1–6 are assigned to Output Level on VPM
Oscillator 1–6, EG 7 is assigned to Output Level on the PCM
Oscillator, and EG 8 is assigned to Filter A Cutoff.
8–1: EG 1
The EGs, or Envelope Generators, let you create complex,
time-varying changes to AMS-modulatable parameters. The
controls on this page specify the shape of the EG. Among
other things, you can:
• Create the basic EG shape by setting the levels and times
of each segment.
• Control the curvature of each EG segment, for subtle
control over the sound of the EG.
• Set up complex modulation of EG levels and times.
• Set up an AMS source, such as an LFO, to restart the
EG.
One thing that you can't do on this page is to control how
much effect the EG has on the parameters it modulates. To
do that. you'll need to adjust the AMS intensities on the
pages for the individual parameters.
8–1a: EG Reset
AMS
This selects an AMS source to reset the EG to the start point.
For instance, you can use a tempo-synced LFO to trigger the
EG in a repeating rhythm.
For a list of AMS sources, see "Alternate Modulation Source
(AMS) List" on page 1109.
Threshold
This sets the AMS level which will trigger the EG reset.
Among other things, you can use this to adjust the exact
point in an LFO's phase at which the EG will be reset,
effectively controlling its "groove" against other rhythmic
effects.
When the threshold is positive, the EG triggers when
passing through the threshold moving upwards. When the
threshold is negative, the EG triggers when passing through
the threshold moving downwards.
Note: with some LFO shapes, and with faster LFO speeds,
the LFO may not always reach the extreme values of +99 or
-99. In this case, setting the Threshold to these values may
cause inconsistent behavior, or may mean that the EG
doesn't reset at all. If this happens, reduce the Threshold
until the EG triggers consistently.
Trigger at Note-On
On means that the EG will start automatically at note-on.
This is the default.
Off means that the EG will only start when triggered via the
selected AMS source. This is useful for delayed EGs, or
triggered effects such as those described below.
388
[List of AMS Sources]
[–99...+99]
[Check-box]
These EGs are similar to those of the AL-1, but with slightly
simplified AMS modulation, Sustain Level modulation, and
a new parameter: Trigger at Note-On.
Note: even when this is set to Off, if the selected AMS
trigger source is above the threshold at note-on, then the EG
will trigger instantly.
Tip: Multiple Rhythmic Envelopes via the Step
Sequencer
1. Set up several EGs with Trigger at Note-On set to Off,
and the trigger AMS source set to the per-voice Step
Sequencer.
2. Set each EG to use a different threshold value, so that
the first to trigger has a low threshold, the next to
trigger has a slightly higher threshold, and so on.
You can then use the Step Sequencer to trigger each EG at a
specified time, synced to tempo. For complex rhythmic
variations, you can then loop the Step Sequencer, modulate
its start point, and reset the Step Sequencer from another
AMS source.
Tip: Multiple Rhythmic Envelopes via LFOs
1. Set up several EGs with Trigger at Note-On set to Off,
and the trigger AMS source set to one or more LFOs.
2. Set the LFO(s) to sync to tempo, with a large note
value (such as a whole note).
By using a couple of LFOs at different frequencies, you can
set up complex, essentially non-repeating patterns.
3. Set the LFO waveform(s) to Triangle.
4. Using the same trick as above, set the EG's thresholds
to different levels.
You could also use this method with non-tempo-synced
LFOs and slow EGs, to create gentle, evolving sounds.
8–1b: Envelope
EG
Attack
Bre ak
Level
Level
Start
Level
Change to
Parameter
V alue
Attack
Decay
Time
Time
N ote-on or reset
Envelopes create a modulation signal by moving from one
level to another over a specified time, and then moving to
another level over another period of time, and so on.
The parameters below let you set five levels, the amount of
time it takes to go from each of the levels to the next, and the
shape (from linear to curved) of each transition.
Sustain
Level
Rele ase
Level
Time
Slope
Rele ase
Time
Time
N ote-off
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