4ms EnvVCA Manuale d'uso - Pagina 5
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The EOF (End of Fall) jack is specific to Channel B. It outputs a gate that
goes high when the fall stage ends, and remains high until the envelope
begins rising. Said another way, the gate at the EOF jack only goes low
during the rise stage. The EOF light will shine orange when the EOF output is
high.
Audio In, Audio Out, and VCA CV Jacks
The Audio In and Out jacks are the input and output of the VCA. The
A
envelope output (pre-level and offset pots) is internally routed to the VCA CV
input. When the envelope is stopped or at 0V, the Out jack will output silence.
In
As the envelope rises, the signal will get louder until it becomes as loud as
Out
the input signal at the peak of the envelope. As the envelope falls, the signal
VCA CV
will fade back to silence. Audio In B is normalized to Audio In A, as
indicated by the graphics on the faceplate. So when Audio In B is
Audio B
unpatched, the Audio In A signal will be sent to both channels. Patching into
Audio In B will break this connection so that both channels are operating
independently.
When patched, the VCA CV jacks break the internal connection between
envelope and VCA, allowing for independent use of the VCA. The VCA CV
input has a range of 0 to 5V, which translates to about -90dB (silence) to 0dB
(unity gain).
Trigger Jacks
Each Trigger jack requires a trigger of at least 2V to start an envelope. If
there is no envelope in progress, then a trigger will initiate a single complete
envelope. If the envelope is rising when a trigger is received, then the trigger
is ignored (unless the RETRIG jumper is installed, see below). If the envelope
Trigger
is falling when a trigger is received, it will begin rising from its current voltage.
On the back of the module is a RETRIG jumper for each channel. When this
jumper is installed, the envelope will immediately jump to 0V and start rising
any time a trigger is received. This can cause a click on the VCA output, so
the jumper is not installed at the factory.
Follow Jack
The Follow jack is the input of a slew limiter, and can also be used for
complex envelope generation, exotic audio filtering, and envelope following.
Whenever the internal envelope is not triggered or cycling, the envelope
output will rise or fall in order to match the voltage level present on the
Follow jack. However, the rate of rise and fall times is limited by the positions
of the Rise/Fall sliders and the CV amounts. That is, the envelope output will
Follow
try to "follow" the signal present on the Follow jack, but it can only rise and
fall as fast as the envelope would rise/fall if it were to be triggered. Since
"slew" is the rate of change, we call this "slew limiting".
Slew limiting can be used to create complex envelopes (ASR, ADSR, etc) by
timing the signal on the Follow and Trigger jacks. See Fundamentals of the
Follow Jack on page 14 for more information.
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