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More on Flexi Range Control
In the above example, you may have noticed that, interesting as they were, the modulations
we set up using the Flexi controller caused the sound to repeat the same way each time we
played a note, using any given setting. This is because we used an envelope; an envelope,
along with the LFOs and noise sources, belongs to a group of sources that we cannot
control directly as we play. These are known as i nternal sources. In the FI, there is also a
group of e xternal s ources and these sources a re under our direct control as we play. The
group consists of the Envelope Follower, Accent, Pitch, Aftertouch, Pitch Bend Wheel, or
any assignable MIDI CC.
Any external source can be used as a Range Control. A Range Control allows us to
manually limit the amount of modulation applied from the control source to the destination.
Turning back to our example, we could for instance use an expression pedal sending out
MIDI CC1 to control, in real time, how much the noise envelope affects the pitch of VCO1.
As you already know, a Range Control can act with either positive or negative polarity:
With p ositive p olarity (+) , then, when the range control is at 127, the control source will be
completely uninhibited and will act with maximum amplitude upon the destination. By
contrast, when Range Control is at 0, the modulation will be suppressed.
With n egative p olarity (-), then, the reverse happens; when Range control is at 0, the control
source will be uninhibited and will act with maximum amplitude upon the destination. By
contrast, when Range Control is at 127, the modulation will be suppressed.
Special Flexi-only Modulation Sources
There are eight modulation sources in the list which can o nly b e used with Flexi Controllers -
they are not found elsewhere in the editor. Six are LFOs and two are noise sources. They
are explained below.
● VCO3/VCO4 LFO (TRI/SQR/SAW):
These two LFOs are completely new to the FI. Each of the two LFOs has three
waveforms - saw, square and triangle. To conserve precious space in the editor,
some sharing of sliders has become necessary: the LFOs' frequencies and pulse
widths are adjusted by using the LFO FRQ and OFFSET sliders from the PULSE
WIDTH sections of VCO3 and VCO4.
In order to have many different applications using a broad range of frequencies,
VCO3 LFO is four times faster than VCO4 LFO.
VCO LFO 3 is free-running, whereas VCO4 LFO is synchronized to the trigger event:
whenever you play a new note, the phase of VCO4 LFO will be reset.
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