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Advanced Applications - Chapter 6
Q20 Reference Manual 97
Ramp. The Ramp Local Generator is similar to the Envelope Generator, except
that it doesnÕt have a release stage. It lets you modulate a parameterÕs value by
having it slowly move from a minimum to a maximum setting, or vice-versa
depending on whether the modulation amplitude is set to a positive or negative
amount. The Ramp is useful for having an effect Òfade-inÓ by modulating its output
level. Try it out on a chorus or flangerÕs output Òpatch-cordÓÊlevel to slowly have
the effect become more and more dramatic.
The RampÕs Trigger Source can be either the Left or Right input, or both inputs. The
Ramp is triggered when the audio at the input(s) exceeds the Attack Threshold you
have chosen (-40 to 0 dB). Once triggered, the Ramp will increase or decrease the
modulation destination at a rate set by the Rise Time (0.00 to 10.00 seconds). It will
then stay set at full indefinitely. When it senses that the audio at the input(s) has
fallen below the Attack Threshold setting, the Ramp is ready to be re-triggered.
However, it will remain at full until it is re-triggered (when the audio at the
input(s) exceeds the Attack Threshold), at which point the Ramp will instantly
drop down and climb back up again.
ATTACK THRESHOLD
MAX MODULATION
AUDIO PEAK INPUT
Left or Right Channel, or
higher of Left and Right)
RAMP OUTPUT
RISE TIME
Modulation Page 4 allows you to select the type of each Input Generator. The
remaining pages in Modulation Mode will appear differently in the display
depending on which type of Input Generators you have selected. This may be
confusing at times, since both generators could be set to Input Envelope type, or you
could have Input Generator 1 set to an Input Envelope type while Input Generator 2
is set to a Peak Follower type. Once you are in Modulation Pages 4 through 7, you
can select which of the two Input Generators you want to edit (much the same way
you would select a Modulator in Modulation Pages 1 through 3).
Low Frequency Oscillator. The LFO Local Generator lets you modulate a
parameterÕs value in a cyclical fashion. The LFO has a single parameter, Cycle
Time, which can be set between .14 and 35.14 seconds. Because the LFO produces a
Òback and forthÓ motion, its effect is identical whether the Modulation Amplitude
parameter is set to a positive or negative amount.
Footswitch. This local generator allows you to use the Bypass or Advance
Footswitches as modulation sources. This is useful when you want to switch effects
on and off, rotary speed fast and slow, or other on/off modulation destinations.
Note that assigning the Advance or Bypass footswitches as local generators
overrides their default functions (i.e. assigning the Bypass footswitch as a
modulation source wonÕt bypass the effect youÕre modulating).