VCA
The VCA (Voltage Controlled Amplifier) is a voltage controlled, that means an
electronically adjustable, amplifier. It’s used to set the signal level by use of control voltages.
That’s how dynamic level changes are created. The VCA has a control input that is hardwired
to envelope 2. The envelope amount is set in the VCA section of the SUNSYN. The
corresponding (Env Amt)-knob can
be found in the upper right corner of
the VCA section. The envelope
amount defines the intensity of
envelope 2 on the VCA (= how much
it influences the level).
Next to that, the VCA has a user-
definable control input in the
Routing System.
Envelopes, VCA
The SUNSYN offers two envelope generators. They produce ascending and descending
control voltages. They are used to produce the Ñdynamic“ part of the sonic changes. Their basic
functions are controlling the signal level and the sonic course over time. Envelope 1 is
hardwired to the filter cutoff. Envelope 2 is hardwired to the control input of the VCA. This
way, you don’t need any additional settings to program dynamic filter- or level-changes. Next to
the hardwired routing, there are also Routing Elements that can be used to route the envelopes
to other parameters. More on this later on. Both
envelopes are built of discrete analogue circuitry.
The result is that there’s no time needed to
Ñcalculate“ the corresponding parameter
settings. The changes are very direct and lightning
fast. This is important for percussive sounds.
These are the envelope parameters:
Let’s start with the VCA envelope (= ENV 2):
Envelope 2
Envelope 2
is connected to the VCA and controls the level of the sound over time.
Attack
The Attack parameter is used to
adjust the Ñstarting“ time (the
time it takes to go from zero to
the maximum value). Lower
values mean a short and direct
start. Higher values allow for
slower sounds.
VCO
3-7
040
Single Mode
High
Amount
Envelope Parameter
Low
Amount
Time
Level
Release
Key-Trigger
Envelope Parameter
Level
a
d
s
r
Time
Release
Key-Trigger
thebook-all 07.11.2002 18:28 Uhr Seite 40 (Schwarz Bogen)
