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Chapter 6: Modulation and Envelopes
ANDROMEDA A6 REFERENCE MANUAL 155
How Modulation Triggering Works
When a modulation source is selected to trigger an envelope, the envelope ignores
Note On messages (the keyboard, MIDI Notes, and so forth) and instead looks at the
selected mod source for its trigger signal. In the examples below, we chose LFO 1 but
the trig source can be another envelope, the Pitch Wheel, a foot switch and so on.
Before triggering takes place, the envelope “looks” at the mod source – in this case
LFO 1 – for certain conditions that generate the trigger. When these conditions have
been met, the trigger occurs and the envelope plays.
In
EXAMPLE 1, the “conditions to be met” are: 1. the LFO must reach a level on its
cycle of 75 (
LEVEL value of 75) and 2. when this level of 75 is reached, the LFO must
be “moving in a positive direction” or rising in level (
POLAR setting of POSITIVE).
Notice that the trigger is generated on the LFO’s “up slope” when it reaches a level of
75.
In
EXAMPLE 2, the same LFO and level setting of 75 are used but this time the
envelope will look for the LFO to be “moving in a negative direction” or falling in
level (
POLAR setting of NEGATIVE). The trigger is generated on the LFO’s “down
slope” when it reaches a level of 75.
In
EXAMPLE 3, polarity is set to BIPOLAR or bi-directional. This means that triggers
are generated whenever the LFO’s level = 75 no matter what direction the slope is
going.
In the examples, take particular note of the shaded areas of the graphs. The light
areas indicate that the trigger is on and the dark areas indicate that the trigger is off.
EXAMPLE 1
User Parameters:
Trigger In Level =
75
Trigger Polarity = POSITIVE