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Chapter 6 - Advanced Applications
96 Q20 Reference Manual
Local Generators
The Q20 is equipped with two Local Generators which can be used as Modulation
Sources. Each Local Generator can be set to either one of five types: Input Envelope,
Peak Follower, Ramp, LFO or Footswitch. The first three allow different ways of
having the audio signal at the Q20Õs inputs modulate the parameters of a Program,
and the second two use internal sources. The Input Envelope, Peak Follower and
Ramp Local Generators may be triggered by either the Left Input or Right Input, or
both Left and Right Inputs. They may also be triggered by the Digital Input, if
Optical or S/PDIF Data is selected as the Input Audio Source (on Global Page 4).
Input Envelope. This uses an envelope, similar to the type found in most
synthesizers, which is triggered once the audio signal at the Q20Õs input(s) exceeds
the Attack Threshold you have chosen (-32 to 0dB). Once this happens, the
envelope opens up at a rate determined by the Attack Time (which can be set from
0.00Ð10.00 seconds). Once the input level has dipped down below the Release
Threshold (-50 to 0dB), the envelope closes at a rate determined by the Release
Time (0.00Ð10.00 seconds).
ON THRESHOLD
AUDIO PEAK INPUT
OFF THRESHOLD
MAX MODULATION
ENVELOPE OUTPUT
0
ATTACK TIME
DECAY TIME
(Left or right Channel or
higher of left and right)
Peak Follower. The peak follower will follow the audio input to its loudest point
and, as the input level drops, the peak follower drops at a constant rate determined
by the Decay time (0.20Ð10.00 seconds). Once the input level exceeds the Peak
FollowerÕs level, the Peak Follower is raised to accommodate the higher level, and
then (as the input signal again falls) proceeds to fall again using the same Decay
time. Since the input levels may be too low at times for the Peak Follower to have
ample effect, its Gain may be set to multiply the inputÕs level from x1 to x99.
Peak Follower 1 and 2 have identical features and work as shown below:
SLOPE IS SET BY DECAY TIME
PEAK FOLLOWER OUTPUT
AUDIO PEAK INPUT
(Left or right Channel or
higher of left and right)